Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6b5e671c1acfb16…

MALICIOUS

PDF

320.8 KB Created: 2021-07-08 00:12:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4f0ba9aa9df887a7411860c8481151ad SHA-1: 8e4fbb2275cc5940092c6f9c261ac756cbb0aef1 SHA-256: f6b5e671c1acfb1655796e4a19ac2b88ffa615ee9b9546388bf672460372cede
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains multiple links to compromised WordPress upload storage, suggesting it is part of a phishing or malware distribution campaign. The heuristic 'PDF_SEO_UTM_REDIRECTOR_LINK' indicates the links are designed as an SEO redirector for a free-download lure, which is a common phishing tactic. No scripts were extracted, but the presence of numerous external links points to an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8125

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/33d009f7486f15a179e6cf362f444489/tifatexujogiz.pdf In PDF document text
    • http://optimaglobal.net/ckupload/files/40965280524.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/59822662278.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838168bed2c---sedumoxajosovuk.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/o4ei5kk2avkhnc25rvb6knti33/fegexezoxuzeniges.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/l0og90m9komha74lmbvso37vmh/80297687806.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073742c120c3---91703994127.pdfIn PDF document text
    • http://mopron.ru/upload/files/59240721754.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/086c32fda41b07987d048bbea1c51e11/momevobowoloziniv.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/1b496d92ddfd6943c3806e75f142a328/sekixepazarakulufo.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/86522636807.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/389489bf373bcd7ab9371e674d6e72eb/51345788621.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098361d1eb33---pubiboravefirusolawejepid.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/a4c606af18b8b6186837c02232352a30/34270721947.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/efcc0218fac79da97d7d3737651c0654/siwiturewenetobaxuwexa.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents//files/bejerorozorufu.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/9b8721c0acf89bb7fe95cc94106adf8d/77471153781.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/guzovedegivumomud.pdfIn PDF document text
    • http://ciskmv.com/css/file/72832492124.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/4c4cbfabc3fefce51279f3ede214ebf9/65777296312.pdfIn PDF document text
    • http://phsclassof1970.com/clients/875774/File/88760578989.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3c85dce2f---gulelosufoxuratuvojo.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607821d7ad468---zuvuxizesojowojagazim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=number+of+special+charactersPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001edb4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1EDB4 254024 bytes
SHA-256: 4e15cce0dab91da634dd14d14983cf3753b25f3dbae6150a5ac37916d76d621b
font_00_sfnt_off0001df01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DF01 3688 bytes
SHA-256: 03d63768787211790a5aa160efdeed32bc7d20618d95d6760a9867cfff353e2e
font_02_sfnt_off0003965c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3965C 10860 bytes
SHA-256: 7da1914b5738174844469704efd4c713f534800e841b883922e6adc8ccdbf715
font_03_sfnt_off0003af3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3AF3B 106324 bytes
SHA-256: 8207dd6112baf4bde9fc3d0093c46154cd156b731e82128e54fb4e4e7cfde9f9
font_04_sfnt_off0004aaf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4AAF5 1284 bytes
SHA-256: 3f2eb68e56e0cc9b24f861ad510cb196f24dbc520975aefba06cb0b93c7ac786
font_05_sfnt_off0004b254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B254 18256 bytes
SHA-256: b18583b965c227889ba73cf849f83acd5d8ed9f8e04693db55661ae96d22acc2
font_06_sfnt_off0004db7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4DB7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1