Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e618ca8a0a3f44b…

MALICIOUS

PDF

74.2 KB Created: 2021-05-08 23:44:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2677f5f61d2324afac1ae26e12a6c0dd SHA-1: 747defcd8ee704c871790b90211e45179b6359a4 SHA-256: 1e618ca8a0a3f44b6b09a0250c0d03f9d92eb3405673600ca5e6efd56be9209d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of external URI heuristics and link farm detection rules points towards an attempt to redirect users to malicious content.

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://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/f706af6f216c69e4aace9241721420c5/16563263719.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff4be925f3---61731636638.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/daa516d03c9bb386db518e77187608c0/suweredurexavus.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160841f514bea7---donuponunasupekebinem.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830f35ea8c0---gizexivaledinig.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924e8563df6---negevebidakurebe.pdf
    • http://allamericannursing.com/userfiles/file/23487464874.pdf
    • http://monkey-do.net/userfiles/file/daduwasanomeletavusudi.pdf
    • http://asustainable.com/global/file/65317312067.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607095427c69a---fumud.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16096b7d8b6074---69121842235.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/1886d0d40553a0d8456d89d466231de1/11482096900.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761ca934140---zotokafaluramemanuxazuket.pdf
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/0e821a8d8c1fd6128e8141fc8da889ca/6286043781.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/8g39jnh14djb8lms00r54s9ast/37435022379.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864172c5ea0---mosarovavimus.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=irrigation+agronomy+pdf
    • 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_off0000e5a1.bin
9b87a2d14a3415b3a69529fadf87a7c621d84c22f2e769d96ee8c1d810276e1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A1 5192 bytes
font_01_sfnt_off0000f743.bin
d8a4092f105a80d66f1ec1945567c63fda48e5dc7f283cc076fad2ae993893f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF743 11032 bytes

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