Malicious PDF — malware analysis report

Static analysis result for SHA-256 164dd55b111de18a…

MALICIOUS

PDF

65.2 KB Created: 2021-05-30 07:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e98b355269a320ee2daddca0be4489d6 SHA-1: a87ac199d1909e9e338483aff1c976b1da7d5b0b SHA-256: 164dd55b111de18a779393f32f899b7b76833906b1f4b66e9e7e5680d22edd7b
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/f7e02fe1f0cc0400cf8d630cc174d2cb/90620609050.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/2qo6138dhaom20211nsf6gi496/vajawovunasabapekudafikog.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/e1df8eb84484b5759aa7166a13ecf208/pifabomelisokubexunumu.pdf
    • http://firewheels.pe/userfiles/file/52883024076.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/e72e329c9581b4cff6d4dd0dcf0b9902/80600574058.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609851f09f45c---92269816317.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/98c30e81f8b32dabc9d379e05f2c571c/budidifazekesilatu.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c42b1b3376---sitarup.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160a25b5229126---81606514961.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/pttdk95jdvaqvktv0d32d97eo7/55953276918.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607819ea37b5a---lovuxig.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b5244aaf---76818911818.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a09c5b39b---82517662870.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=play+games+to+earn+money+on+cash+app
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c357.bin
df96e8460e0d736a21e293dbec4ea5bdaa6f610286fd1c2b6dd7cc57ab93952a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC357 5452 bytes
font_01_sfnt_off0000d5c4.bin
cddb977a650fe06c1e9a2d3dc166eba212cafd4da0ac089099e5465b9b9d74b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C4 10312 bytes

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