Malicious PDF — malware analysis report

Static analysis result for SHA-256 acc30269fd4416ce…

MALICIOUS

PDF

70.4 KB Created: 2021-06-07 07:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0073fe360972eabd0ebe99f7aad691a2 SHA-1: 023abeca1adfe6f3117d1572108eb0b207a60d0d SHA-256: acc30269fd4416cec45de24bb00f446881f383db776997b9b482650b3719bc66
156 Risk Score

Malware Insights

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

The PDF document uses a lure of 'Romance d'amour piano sheet music pdf' to disguise its malicious intent. It contains numerous embedded links, many of which point to compromised WordPress sites, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious content, likely a phishing or trojan delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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=romance+d%2527amour+piano+sheet+music+pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/abc9b7e5768a51c631c28740f32f5d9a/61394068629.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc24384d0b---27237479194.pdf
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210604015018.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/69aef907355a3fe1b8e7d114ca211922/voduwetazuluzokasujopogem.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed48f36200---55152917165.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/3lj5k33s0vbbmnma0cfn1gvem6/29775585810.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/cdbf644c335500378ea84c4c15a30bc0/41399181858.pdf
    • http://ateliergermain.net/sites/default/files/file/33010036203.pdf
    • http://pincailight.com/zk/UploadFile/file/2021060500191273499.pdf
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f06765ccfe---51310438787.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/1afaef9a1e3b383db797df2026389ea2/xumusato.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/aa2c3a40bef6354d5e21ed7b35d9716a/34426227717.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/ernn9qisfdc12t2u7ohrnjui1q/20855870842.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/c4a18c9890c74154624f146dc2bc79f0/wizuzud.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719091dd217---dakeguf.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/l8k6g7i7dqvaceba50tdbohct4/jupimafifexexol.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000d83c.bin
464f47ff2ddd5ab9d63e9dabd9d824e54c84326a5dee25367903bc9b1d331d53		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD83C 5404 bytes
font_01_sfnt_off0000ea75.bin
2916cfe00146428a7319ff8bc1d019ff66b98b5b143f78f49e50ad318dd1c34d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA75 10060 bytes

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