Malicious PDF — malware analysis report

Static analysis result for SHA-256 8140654c554c86c9…

MALICIOUS

PDF

75.1 KB Created: 2021-07-04 03:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 471a4b9158ee09a8800fc6cdfd366d26 SHA-1: 98c50607848ac8941e3b86c70029fa30beb98fb7 SHA-256: 8140654c554c86c97f427a2ff9f7da969565a0a18a4c69704c9754d819b091a1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • 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://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/95ff1d2d476f0d52a015403fb8493c54/lisurudemesinigitoxeganog.pdf
    • https://synersys.fr/contenu/file/dimadurulixigedovaxifubol.pdf
    • http://voijin.com/userfiles/files/36267224164.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/97f86ab54a2661b2b359616145794e73/52015908668.pdf
    • http://minhvuongthuphap.com/upload/ck/files/42503399873.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/43f1326163568eccd2ac981b9c7c8c7f/nevaviwapoxegekopajufuxon.pdf
    • https://stallion-international.com/userfiles/file/lovevatimarerolu.pdf
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/c5f5316e09b7541ddff064d6327798b0/4624556954.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a8a66ce9e---87911712579.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd5a27da3c---zebug.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a899dfc8bcf---2618126966.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/b006f9a3283f657c163c0005303346c6/jabaroxu.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16079e2d0143c7---puwef.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160850c9e3bc41---69478111778.pdf
    • https://aduanaldelvalle.com/userfiles/file/mekenonodu.pdf
    • https://associazionedynamica.it/uploads/file/karaliwudigufupoka.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/u2292dn4g00tntduq4mhbqf11m/27226196278.pdf
    • http://xn--om2b25zm6igqb.com/ckupload/files/lajomaji.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b1b518798---83611627774.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d0d0486f0---sowurojofezesofuderevife.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/kq0fa2ra8io067mu2qkhb5pt76/jesuzixilenire.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb79500107---61519948191.pdf
    • http://transsnabstroy.com/userfiles/file/74224625421.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=immigration+asylum+and+nationality+act+2006
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1c6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C6 16792 bytes
font_01_sfnt_off0000d9dd.bin
ec78d784908c27559aaef9cafb973c19c858640c2dd2256e44dce81b56a09a3c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DD 11156 bytes
font_02_sfnt_off0000f3bf.bin
d058324e76be17f1f4b7c15755aa1feead152cf88e49cb8ec5b72b24f0d307e7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BF 16152 bytes