Malicious PDF — malware analysis report

Static analysis result for SHA-256 55f5f882fadbd312…

MALICIOUS

PDF

82.2 KB Created: 2021-07-04 20:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4dc23383cd9c1f88f10dc1238501ef42 SHA-1: e999548b215681df51aa9392e2c56e9e27dd27eb SHA-256: 55f5f882fadbd312b496cdd6a931d80029fb83db952b74e2b9fc5c420e42b975
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous external links, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to delivering a malicious payload or redirecting users to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://crewmak.ru/uplcv?utm_term=bethany+lau+chemistry+answers PDF link annotation
    • http://slp61.com/clients/e/e2/e296dcecfd7d10ffef0cc83fef253c72/File/fopobunadarubuzaxaj.pdfIn PDF document text
    • https://tekartltd.com/upload/files/78143090440.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160788a7502c77---puvewelebumogit.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/h736tg9rncnb5mp0jhmntrg0u9/lidulemekadaxifom.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/67775159259.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/73406906910.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/555e8d7074c99ba3ecfeafbc6a0ee4c5/dolibubalodunijijizotute.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e38bb2e41---jikamujagidesudopoboxet.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f54a8bdf89---valalasila.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/paxabesanagumixitu.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/deliwaxebinoku.pdfIn PDF document text
    • http://starlightcelebre.com/clients/4/43/43e9139217482d7666ce300faf566241/File/63133755102.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c89bac3f196---balavudupexofodirutedu.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/fnj1n5jgfe8kp43hbi8k3ig750/sezisaguxifuw.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_off0000dea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA0 10728 bytes
SHA-256: 625f2db3c691ba07b3f030e34485ae5cb435d1477c45252195bde42b2ccfdc17
font_01_sfnt_off0000f721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF721 17368 bytes
SHA-256: f32b5b0c5cedff9222228ce74cd65ee9b8f9722b33bb92764eb7c901ac2f8000
font_02_sfnt_off0001245c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1245C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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