Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d0720489bcf36a…

MALICIOUS

PDF

88.2 KB Created: 2021-08-13 01:26:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6f5f933b2f7e5a31bb6e13bf8ff16437 SHA-1: 45ba3a72965e35d1117e2285c87d408882899db9 SHA-256: c4d0720489bcf36ac9ffa17372aeb145ea9d466105d94d2191085fe62d2f0ce3
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The file's structure and link farm behavior indicate it's likely part of a phishing campaign or a downloader for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crewmak.ru/uplcv?utm_term=warriors+a+vision+of+shadows+%233+shattered+sky+read+online+free PDF link annotation
    • http://kaies.cn/upfiles/210805134529700202n0p2if.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/19192540524.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/3029ad82b6c05ab46d820d7d962d2cbc/77384829649.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eeff974585---dunemif.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/29457833700.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/46501679112.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/poroxizivezola.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef80e6f310---lokamidu.pdfIn PDF document text
    • http://www.polni.si/Images/files/fewura.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/67324757201.pdfIn PDF document text
    • https://digireg.pl/upload/64215892284.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/80839989378.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-7/20210507130408493431.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/02c23c39ec45e54ed768a3a948816857/70154350926.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/12551989630.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f534c84d6---savifefafipatokufer.pdfIn PDF document text
    • http://capitalclassof1970.com/clients/e/e7/e78cae7b17622b0161c193cbd63f4fd0/File/femojedafo.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/5e6g7llpikl4h6rocsb2ct4je7/17615533470.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/nofewalu.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/95485954503.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/xisewirod.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/22ee4e6daaf3eda35415402cdefdde4d/77527054796.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_off0000f77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77C 10320 bytes
SHA-256: 1b1bd49ee61aa710d62650fa7133984dfbd9c96af0a9eceb611864e30e1191cb
font_01_sfnt_off00010eb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C2 17140 bytes
SHA-256: 233299db6301cdbd3e17c98d09f3e4b8a566ad2477bd91cce8da1c4f76d63a3a

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