Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1631d88eb56ea49…

MALICIOUS

PDF

80.8 KB Created: 2021-09-12 11:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9f482383a6f0d783e4ca92a1f39efc88 SHA-1: 660af4cd1ec51c9e1158f78161a9cc026dec5d25 SHA-256: c1631d88eb56ea49316b9d62e80c6e553621d68384c4f10388c6109aa0b2fc10
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The heuristic 'SE_URGENCY_LURE' suggests the content may attempt to create a false sense of urgency.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://crysiq.ru/uplcv?utm_term=how+to+convert+pdf+to+doc+on+mac PDF link annotation
    • http://zzzwchem.com/upload/files/27673856602.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/8ee37ad03ee4d4511055cb70363161d0/94697895589.pdfIn PDF document text
    • http://opsir.eu/files/file/9592748672.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/kewunut.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/33705360363.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/22234647561.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613838b40406a---viloru.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16139d19dc9f26---kebinikidajupololovosajed.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/70670844175.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f48c507c9e---86774233997.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/86587680195.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/tuwobabowopo.pdfIn PDF document text
    • http://dobermanncz.eu/files/titamab.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/fagaxajida.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/nebafibepowezusozifekotam.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/medukexikolude.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/xuzipoditixak.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/xabedir.pdfIn PDF document text
    • https://tipresentoio.it/images/file/92199348393.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/30363722276.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/64925680098.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edadeeb777---21324320506.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/zirosobovoxirudibedivu.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0f45801e0---43821809694.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/vigobamesavefarewet.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109101552556027.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_off0000d712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD712 17828 bytes
SHA-256: f29c58f60f6c9ce94948eed3908402420812f6e847995eae01ca33df5c473c37
font_01_sfnt_off0001052d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D44 10620 bytes
SHA-256: d304779acfc388f64c7abf1dc9e362b99dc4ab1273c8a8b61718860c2dd49938

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