Malicious PDF — malware analysis report

Static analysis result for SHA-256 afb900f2e7bce8ab…

MALICIOUS

PDF

84.7 KB Created: 2021-09-09 19:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 51e94a9ba278fa6042da88c4d9ead6b2 SHA-1: 53efc63c9baff4efde6b7de2c763e5371c8b7a31 SHA-256: afb900f2e7bce8abc23de49c54acf18ae00ff33a8e8ce55ba3b87802b46bc153
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://queure.ru/uplcv?utm_term=minecraft+pe+pocket+creatures+mod+download PDF link annotation
    • http://www.siposferenc.hu/html/96986404328.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/56889760611.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/11767438672.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/vobewunajafisu.pdfIn PDF document text
    • https://mollis.rs/files/72475332873.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/laxizumofumodonalodudu.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/tozidiburesawufi.pdfIn PDF document text
    • http://mfcpavpos.ru/file/vixurimorexidoji.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/72813550266.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332bb1d0ad3---gekave.pdfIn PDF document text
    • http://poorclarescork.ie/images/golavexulokijekib.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/9957726959.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d3c6f28bd---89889868890.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/91368548354.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/e651bfa0a2a43df71758f1ee265d1b33/zevizerobezolov.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/36060977891.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/jojosurelidesegu.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/juxumusuve.pdfIn PDF document text
    • http://kdekdyjak.cz/data/6219968569.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/39822423525.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/6135ce5e0020d.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/toruzolitutab.pdfIn PDF document text
    • https://nada70.org/userfiles/file/97591068103.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/vegewuraraka.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/jadimutenolujirorek.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/30318576682.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_off0000e451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE451 17848 bytes
SHA-256: 0061d5c5ed639e1910f033984b65c598eb920ee5302fc712da12b73c0a674711
font_01_sfnt_off000112e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E1 11052 bytes
SHA-256: 46749321940cffe85d6038983a8d54439e2411ef69d139a8410a351dd46e51ea
font_02_sfnt_off00012cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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