Malicious PDF — malware analysis report

Static analysis result for SHA-256 40149e3e2673ed9b…

MALICIOUS

PDF

81.2 KB Created: 2021-09-15 11:24:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 139e8841597dc82442f62bd204933d6c SHA-1: 1cb19d635c6500f0234dc52d0fd339effdc56d96 SHA-256: 40149e3e2673ed9b5cefd7d15e30b4854ba6bf551353cebba840fa281983acc9
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous links to external sites, many of which appear to be disposable hosting or compromised CMS uploads, suggesting a link farm designed to distribute malicious content. The presence of a 'download button' lure and a 'callback lure' further indicates a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://pixomot.ru/uplcv?utm_term=pvz+3+apk+download PDF link annotation
    • https://tattica.byespresso.com/app/webroot/files/upload/files/nitapa.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/54375086240.pdfIn PDF document text
    • http://yuha.be/_files/file/24971699583.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1da7f157e---61691926628.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/josufidut.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/padamenifuzegob.pdfIn PDF document text
    • http://mp-journal.com/media/file/babizaviwuvowovet.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/53830617553.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415c97ac8e9---kawizaj.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/bavuvizedo.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/levijesanobodoxir.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/83645605991.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/padukoked.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/63977787091.pdfIn PDF document text
    • http://sushi-belovo.ru/files/1584493329.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/81886381650.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16132671992589---zejotofoziwu.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/88667560383.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/99209000241.pdfIn PDF document text
    • http://benly-carson.com/product/files/voluwemoretulax.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/96856274256.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/74456998732.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/mageno.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/25197300468.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/xabodimureje.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/40335321.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_off0000cfeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEB 21772 bytes
SHA-256: b10d544bbd7e305f85e1aebdba5e73476316ceb8e42659398237476e63c760cf
font_01_sfnt_off000107f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F6 10272 bytes
SHA-256: 7457bc8a5d2aaba95e6c88942a773ab7321481a4d429a487ce09486369d7e5dd
font_02_sfnt_off00011f38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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