Malicious PDF — malware analysis report

Static analysis result for SHA-256 236d345de575b52d…

MALICIOUS

PDF

102.6 KB Created: 2021-07-20 16:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b808add8f9fb8eb553ff5003b45b3d80 SHA-1: 958b43cba9f8047ab0d48589fb795a345c8b5a77 SHA-256: 236d345de575b52d764592497a29515a9bf6ad621a690b0328c0c5ad14c18450
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS upload directories and disposable hosting domains, a common tactic for distributing phishing content or malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the links suggests the PDF is designed to lure users to malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://homeopathyhk.com/files/fuwabajiwetomepa.pdf In PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/2a9jfradu3704317ujdqpm4aas/40648313498.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16090581e85331---gobuxekif.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c14b2b837---23837641919.pdfIn PDF document text
    • https://cafe-malaysia.com/contents/file/kanuxatimonusizuda.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/logafana.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/livivejapipip.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/87caaadca1ebf58550ef47e73b86e83e/lelobik.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc7c8f14e4---42962870175.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c85ad6bba---49928265695.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/paxezajiwu.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/wexuxamikifavovod.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/0bf88019958895f044a635f1c1a210a2/17983037258.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34ee7ea231---10302473677.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/0da9219897edc640dca98bd5c962b2a4/xilatugojilazenugiros.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/19f425c178fce97923be0dd26308340b/jazigogijafuzuxofo.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/3018603810.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/ffcfa15998387889c02e3021e25c35e6/61309908055.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/kivipadilurejuliwuv.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c04c14d6791---kekodiluxezagogo.pdfIn PDF document text
    • http://samtekelektrik.com/files/xukeximupo.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/vf5149m3kf1ff9mk5mjkmcqd8m/figadigipuxofub.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5a0042fd5---96235140121.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/42315733400.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=idol+meaning+in+tamilPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11001 17500 bytes
SHA-256: da50f69af1ff87118f264d51a9ac334110c75edf6642b51c4b34a60cfd25a3c2
font_01_sfnt_off00012a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2A 10272 bytes
SHA-256: 8f7ee6f7a0f8d719abfa8cabe7fe05b9115df5f45924f9a89cc6ca5c1bf5cc14
font_02_sfnt_off000140fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001590d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1590D 19456 bytes
SHA-256: cca79324ab0f498567e5042519fe4d17f70c7144d0207aa92cc7a1e0ca1e842c

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