Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ce929c8f54b3e18…

MALICIOUS

PDF

79.8 KB Created: 2021-09-08 09:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 56abf9abffc74a3859d3a406fa4ce49c SHA-1: e5b4021ca7a2e4f433c00379c3380363bb4178c9 SHA-256: 2ce929c8f54b3e18eeba195becb88ec82aaf0b14eb474f94a5908eef87c7ae62
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a link farm hosted on multiple compromised websites, including WordPress uploads. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, along with numerous embedded URLs, indicates a phishing or scam attempt. The ML classifier and ClamAV detection further support its malicious nature, suggesting it's a phishing document designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jkmdc.com/aversystem.com/userfiles/file/fomivafusosutevimu.pdf In PDF document text
    • http://train-in-japan.com/images/blog//file/20182267905.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/684ff3ibnhin0729lek5947ilo/sotunogipomeju.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/bifutiwuputodurazidorul.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160cb51ac91f8e---99346807112.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/jpndvqauops99e4pc9cvd9mog2/damoge.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/parukotifudadanitoze.pdfIn PDF document text
    • http://auchli-appenzeller.ch/userfiles/files/wizide.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021052611550670554.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16121b1bc20c8d---53103222789.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/8loq0q0mri5ecencd5bcki7o9r/47886523478.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/gebutuxipovenuw.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/165d440e3f806e06e0976e1a29170f4a/tubabasipi.pdfIn PDF document text
    • https://mimpisiluman.com/contents//files/93595231489.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/65193701647.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/digumajun.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae8f1c6b3b---50764453670.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-6-26/20210626090019591642.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/kegaduna.pdfIn PDF document text
    • https://bataretak.com/img/files/file/botejusidulokovofozi.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/58190824074.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/benibed.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/q073sidhk1284t09frlspev5u9/givereb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=kai+greene+ebook+pdf+freePDF 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_off0000d1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BA 18436 bytes
SHA-256: 0fc942b9bad7eac9d8bb4c96ca1b8f212d8b6ecdf3c466c39575db42289063fe
font_01_sfnt_off00010202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10202 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A19 10584 bytes
SHA-256: 7ea08d3cfed57796c72a5bd458db025ced1ca1834898a73128b78f0c21b80b13

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