Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b8044107cd5122e…

MALICIOUS

PDF

82.1 KB Created: 2021-09-20 07:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0ac6fc84ed2f3fdcfa59a45301d249e7 SHA-1: a0fe74d859be8dfe1e3645423f8c1c719aa439ba SHA-256: 5b8044107cd5122e5364d2d785d64eb7e77a6df9eecbad122c6f776f5e60386b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous links to external sites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure points to a malicious document delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://greenearthgardens.org/userfiles/52581332212.pdf In PDF document text
    • http://www.bluewhaleline.com/image/upload/File/tasakimitod.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613018a8eab2b---35080610623.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210903/files/20210903050141.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/10295259109.pdfIn PDF document text
    • https://telorgabus.com/contents/files/gizubuxovopezalozuminigep.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161452e15e73af---togotanini.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/bafoleduf.pdfIn PDF document text
    • http://badgerhillfarm.uk/detevoxonugapafipek.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/27610241674.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/50503146695.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/kijupuwamotufen.pdfIn PDF document text
    • http://konberdbio.com/upload/files/26209576864.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/28983602739.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/17444436601.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340ae7213a0---nekige.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/29728121097.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/4483b33e2ffb133032055f6df884fd57/91774952529.pdfIn PDF document text
    • https://costarica4d.com/contents/files/29063929325.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/manujodopifedudov.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/39767706899.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/83158284256.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/34519067819.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/muragonofobababiniruxi.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/puwomefivufomuzixinas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=thunderbird+android+emailPDF 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_off0000dc08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41A 18044 bytes
SHA-256: de3a0fe93b4c04a7948ec7c96c572fdb3ecd10dedcf1d88bd61e6794f6b149d4
font_02_sfnt_off000123af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AF 10448 bytes
SHA-256: b91c3e8954ed800d4c3bf576d1b2bb7edfc6fef236e060a902d35f2c3fb198b1

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