Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff3b007c70a460da…

MALICIOUS

PDF

88.4 KB Created: 2021-09-15 06:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ad5482a87d17e8461456c3cccd8ccae0 SHA-1: c1d3b23789aaab2ae12f3a6cfefc1935761fcfb0 SHA-256: ff3b007c70a460da59fc494d44f270687d2423b35ffe82abf45e4dc2bfcce70a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload storage, suggesting a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pamukoglu.com/userfiles/file/58527634828.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318bdfeaa8f---5452088551.pdf
    • https://maintogelonline2.com/contents/files/dijuzivolapize.pdf
    • http://frutapac.es/ckfinder/userfiles/files/wimov.pdf
    • http://cgpreceptor.com/ckfinder/userfiles/files/97502777244.pdf
    • http://madmojo.com/fckupload/file/rabatasulokila.pdf
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/23885873612.pdf
    • http://jjw-led.com/userfiles/file/fuvilowa.pdf
    • http://greenworx.eu/images/uploads/files/roletokixunafi.pdf
    • https://yunglin.com/uploadpic/files/tiwatalutoserifabinaga.pdf
    • http://snailgame.ru/upload/files/20210912005129.pdf
    • https://blueparadise.pl/userfiles/file/67737062438.pdf
    • http://ankurgroups.com/userfiles/file/zibilirukexobizenojak.pdf
    • http://taigesw.com/upload/files/rejupojokimuwag.pdf
    • http://eskuvotoszkanaban.hu/editor_up/62139852348.pdf
    • http://kme-kme.cz/files/file/55576027185.pdf
    • https://www.medicalbi.com/ckfinder/userfiles/files/waturugiwazilupedek.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/161381098ec4da---7244890163.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/unlqiafeagn70gdt7rtoj15jk2/fujelijoxavam.pdf
    • http://sziszolg.hu/editor_up/89853465935.pdf
    • http://change4best.ru/upload/file/jogupaxufipuledomefopiz.pdf
    • https://fwstc.in/userfiles/file/74073706345.pdf
    • http://bestapp4u.com/admin/uploadedfiles/file/9177953025.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f792a8fc30---69664417168.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=best+free+video+editor+apk
    • 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_off0000f426.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF426 16792 bytes
font_01_sfnt_off00010c3d.bin
7a3ee840d5e049cbcd0f5c918194ba08b5b06c98230b0f4606da2160fd0b9f12
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3D 10552 bytes
font_02_sfnt_off00012484.bin
48f1ce28292b4746e87b2aea2ce1b6ea22cbfe4b5a8bf663d74ae49099bae2e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x12484 18304 bytes