Malicious PDF — malware analysis report

Static analysis result for SHA-256 02416e8e461bd1f5…

MALICIOUS

PDF

81.1 KB Created: 2021-07-14 09:23:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2e14538fbabd0e3af9a500354e2eecde SHA-1: 76ab09e9a189ae5f58ef9d7e33e7003e43501865 SHA-256: 02416e8e461bd1f5e8a8153a25410d2b869e6b7a8c7fee959e90aa8313c515eb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised WordPress upload directories, suggesting it's part of a link farm designed to host and distribute malicious files. The presence of a download button heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.
  • 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://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/c7d8072e6647c2c9d60476e5b95c3cb7/77636478020.pdf In PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e97342656---zujewawixolorapijo.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/jidakamerewav.pdfIn PDF document text
    • http://fittbike.hu/files/file/43470942029.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/67e9c7ce1d31666f143b1690018a6306/51642176928.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/06b919ff42ec1436ba74e4eddb421371/9564816363.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096bd380d428---tases.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/77444208690.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/890feaf46829875480b7db2c69a62e9e/31892632244.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/912a01c4622ab52426901089d46d6028/soxawamofademipakobaxulem.pdfIn PDF document text
    • https://nada70.org/userfiles/file/74526043963.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/jolipu.pdfIn PDF document text
    • https://standardpromotion.com/images/upload/userfiles/files/bozunawagabuwipuzu.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/xapoxupiju.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607434dac2780---jugororofexamepowo.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/lobaxewowipudo.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/tukonabiwe.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/16/file/20210516_163651_118.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/9511028537.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/ff6dc7ef583c7384739b805c9ead8971/46848576853.pdfIn PDF document text
    • https://wittnebel.dk/file/buwofafagoz.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/ba8da8c9e01a37f54c1ecd581e6c5bd2/16795848278.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097cc83a38f3---19916120430.pdfIn PDF document text
    • http://bulmarconsult.com/files/nasis.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/jumukulirejibaxipesoku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=church+policy+manual+templatePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC97 10716 bytes
SHA-256: 5aafa0aafef1d928714b22509215a9c5f33bf0adba68585e32d6a0221c0a8471
font_01_sfnt_off0000f50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1E 16264 bytes
SHA-256: 0a2480ae0fa8bd02338e530bb34461cde8f1d7c5e8668f17324fb4c6ae9420d4

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