Malicious PDF — malware analysis report

Static analysis result for SHA-256 42a4694dc03c7434…

MALICIOUS

PDF

80.4 KB Created: 2021-09-05 22:23:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d83a6b0924ae7904d3d56d0220e3fd33 SHA-1: 2a6cfd2cd2c580d9fc5f550534217e59480c3df2 SHA-256: 42a4694dc03c743499e9f8ca0e11f4ea440667a38762bf6a5640e7c45d6aa64d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a campaign to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://ajivikafinance.com/userfiles/file/13425556214.pdf In PDF document text
    • https://arte-salon.ru/upload_picture/12463148150.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c994dcb863---temudamavowizex.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/ba1a7eb791ff6f9b72da444297be1d34/66930289147.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/mupusixogiwiwugetopo.pdfIn PDF document text
    • http://1975geegees.com/clients/78603/File/pupatarugezasoz.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/mukavebowevawok.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/punevalupevenikawigibewez.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/26242929143.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/e924375782675464e8e7d2e99b500114/70678814766.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/25607506521.pdfIn PDF document text
    • http://hi-techfiber.com/userfiles/file/221068775.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160afe5028e566---solubunapotigafizibimip.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/e765658bd194df8fd16c42ac511ee531/fawejejikodonifabifodaba.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///86867795962.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/j5lhij90dhueepsu3pr7hvu6o2/76454236776.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a175924de1---2496686627.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609490403036a---votopasofibojexege.pdfIn PDF document text
    • https://heyratacademy.ir/file/vozuwosevimobewokedalumun.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/ff3a5038030552d24834a3a872c3e49c/94757468118.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c494d9352dd---92475962250.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/254e2df137cc67c792c131e6f3788ebf/sexajonivepiguwozililita.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/winixebubigeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=c+language+aptitude+questions+with+answers+pdfPDF 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_off0000d1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AC 18440 bytes
SHA-256: 885c9d8e8f89360b56bf06db4cd4049afbac9242be6932a5b209c0fa358ec055
font_01_sfnt_off00010183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10183 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001199a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199A 11140 bytes
SHA-256: 6ec7654a3b6a34eab716d48b262d01ecfa740077672514bc4820b342fd440d3c