Malicious PDF — malware analysis report

Static analysis result for SHA-256 de86c8110996eb84…

MALICIOUS

PDF

84.8 KB Created: 2021-09-15 17:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d3d25210f7e842c12ec3f73021fb3a0e SHA-1: 94cf0dc72be162ffc033b05b851e4f0a88b22eb9 SHA-256: de86c8110996eb845579c5b6e533a73456b8898adfeb218112c09c17450de20d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to various domains, including one identified as compromised WordPress upload storage. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=critical+thinking+puzzles+pdf PDF link annotation
    • http://pk-rowery.pl/user_pict/file/33896979.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/50723387611.pdfIn PDF document text
    • https://cosmopolitanhotelbg.lastrada.bg/uploads/wysiwyg/files/perekuralawa.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/goxukujodexalujew.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/lixit.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/32958578599.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/36965459101.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/48362647529.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/pakonojakeror.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/53218027961.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109120251564477.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/disasatigadigapakabugoxaj.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131bee4a0f14---bifab.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/linulunufitejonig.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/xijev.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613930131c48a---87007144277.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/mhv9ldpfqjmb9lo5qq27v2ubdj/68015803908.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/47717244023.pdfIn PDF document text
    • https://panoramabyty.cz/content/73028710236.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/toloxunaxusosotifoviwovi.pdfIn PDF document text
    • http://grandfiltr.com/files/file/31044598143.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/72257750733.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/3866894791.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/48990024505.pdfIn PDF document text
    • http://huefpdf.org/upload/file/topewupuje.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/lilexovoj.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F3 18608 bytes
SHA-256: 3031b025fb3f37192581ebd00840f5f216d0bcdfc9cc0edcc77d148007d7f586
font_01_sfnt_off0001136a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136A 11064 bytes
SHA-256: fae870d80fbbccc5dba45c7e3a4a3c82581b208b090c5acc300877eb8ecb8e37
font_02_sfnt_off00012d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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