Malicious PDF — malware analysis report

Static analysis result for SHA-256 136d119ea268223e…

MALICIOUS

PDF

79.2 KB Created: 2021-09-06 23:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e863d748eb55f37ef9b427f6fcd87287 SHA-1: 82c1b4db6e7053a1a33a2b4cd5d8323ef5112130 SHA-256: 136d119ea268223e9025498088b05d7f31c3686d24725db8354877362a8bc010
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may instruct users to open a password-protected archive, a common tactic to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=convert+scan+pdf+to+editable+word+online PDF link annotation
    • https://biocoils.com/img/file/mojedime.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/pupukovapipavamis.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210805_2FB6E026F8DB170B.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/36965918376.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1611c269e76aaa---xirepabasesuvukurekito.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/11817b380f80287dc14fd8184bb6a6fd/41347895466.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae972ac9a6a---75864789738.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/64498933983.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/d6d900af0f9b626f4579a25c53141876/95888199431.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/munaxipidowibofibe.pdfIn PDF document text
    • http://xpressup.com/userfiles/file/bimipunodivol.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/98efbe25364900bae0b2d5ce4ba57f19/54463808093.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/fukobanofexibisux.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/57569416039.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/35670795073.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/fuwafot.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16094733521e54---74267854415.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/parozedexej.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160921ada16580---72786563878.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/lidadebukikalanibuzaw.pdfIn PDF document text
    • https://rpitrade.com/ckfinder/userfiles/files/xobatox.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab55212ad7c---fogux.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/09686db8df524cf72172b31c857c6160/95556957686.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/d0pgurpqdp33vgsgj01ggorvd3/2100630043.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755bba6e94f---gapupisigu.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_off0000d0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DC 16876 bytes
SHA-256: 10120787373a0de56538ef366be6797898628b3144e249026bb28c98dd3f849b
font_01_sfnt_off0000fce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FE 10936 bytes
SHA-256: fd3210e31acd8b0aedfa6ee7cdce5b4523760ce1928fec1c9133d1c507055352

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