Malicious PDF — malware analysis report

Static analysis result for SHA-256 5949f6e70c2a1091…

MALICIOUS

PDF

108.9 KB Created: 2021-06-21 03:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ce4f606b3297baf2c1805d0226c98d6 SHA-1: a224d6b8dff2afdbe6d05f58f4197adb1c3882ab SHA-256: 5949f6e70c2a10918dbc82f44a5c3cfa5c4b628d6ff9bf976a742cd352910444
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised websites, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the presence of numerous external links on potentially compromised domains points towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8703

Heuristics 6

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://angelsstaff.com/uploads/file/28361850974.pdf
    • http://files.ibiza-ferien.de/file/89019852275.pdf
    • https://luminex.pl/upload/file/12231841388.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/eec327068ffaff61067ffafb72521842/66178661125.pdf
    • http://bjhtdszdh.com/v15/Upload/file/2021632338515516.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/e6d4f5942cda57264924068b5fa8b0e1/kezome.pdf
    • http://happy-travel089.com/CKEdit/upload/files/laxowelavilu.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/7h957m57esdpnalt85mtevdkuo/33150252063.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082aea92f94f---wewezixiwejuzusuwo.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/d2cbca920e7b7e40372f3a94d500c7a5/fosamiwupiwilo.pdf
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/zatosixo.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9b4eb4fb7---16573160851.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/683516afda7c6ec84114a0422a0943b6/5321685491.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=dilwale+dulhania+le+jayenge+full+hd+video
    • http://scripts.sil.org/OFL
    • 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_off00016096.bin
bae877c8427e731a9e620192f47601e2735fda9765fb011af450956ff08a2ea3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16096 5224 bytes
font_01_sfnt_off0001728c.bin
4295f36d3c632536b9e799fdeeb3eb60c25c8d75483ce67b55b0a03b1d9bc523		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1728C 11892 bytes
font_02_sfnt_off00019acf.bin
c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19ACF 16164 bytes

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