Malicious PDF — malware analysis report

Static analysis result for SHA-256 671e8cf18c513254…

MALICIOUS

PDF

75.4 KB Created: 2021-09-06 17:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ff2edbd6dac59a65154d0e9923359793 SHA-1: 84b5a57ce41c11f00272ad2e89580ab08d64d81b SHA-256: 671e8cf18c5132549cb54ee72ce2643779beac479a7bbe273e242958e76f16a1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it is likely a phishing or trojan delivery mechanism. The heuristics reveal it functions as a link farm, directing users to various compromised websites, some of which host further PDF files. The presence of external URIs and link farms on disposable hosting suggests an attempt to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://archism.ru/uplcv?utm_term=carestino+manuales+silla+de+comer+plus PDF link annotation
    • http://spreewaldatelier.de/img/editor/file/josupuliwalisajoxirewu.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/da914e598af473fcd5c1f7a23e32945d/70891009056.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/46322478394.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/98404121497.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/tajakajebapoxaxilamenev.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/56546559780.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/9l9ru45u731d76cb500nb203nh/79157368539.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/44082361017.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160944d85e6859---50689705825.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/v6c2h3vps7gdigfro50ec4eci1/45143110940.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090da18a6dd4---dosefefebex.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021072013193973499.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/f0ad3f6f19d1f1e789ecaa79638d7913/werobu.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716e4bdf0e6---53034644394.pdfIn PDF document text
    • http://joomlacode.org/fckeditor/editor/filemanager/img.php?file=file/jifapaju.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8c0410825---tatekavazodito.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3245ea776a---jiwaminif.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/95318722361.pdfIn PDF document text
    • https://etadelloro.it/images/file/93469135207.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/15505107219.pdfIn PDF document text
    • http://eternalcycle.com/FCKFiles/file/kiperogufi.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/gexejurafoz.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/nuxukawunurisibirusogus.pdfIn PDF document text
    • https://tes-sys.com/uploads/ckfinder/files/20210707/16256545571568.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_off0000bd7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD7C 18428 bytes
SHA-256: 2cc91c1cc3c9aef0a8aaba662625c75ddff1df96b037df6f2326ff02f10fff5b
font_01_sfnt_off0000ed13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001052a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052A 10804 bytes
SHA-256: 3e11c63d73d1c2e0da179628b04f339f39e7440937d9d7ba1b7a6de9cd15dbba

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