Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c1c2a51c1e8a0ae…

MALICIOUS

PDF

107.3 KB Created: 2021-07-27 12:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0456813e0cdd83fb8c5ab4a2e917a051 SHA-1: 4ae21b3688bce9e432979bbaa253079f2d4d7a1c SHA-256: 3c1c2a51c1e8a0aebfa62ce04f574f571dd179e9d451bfb291b1fca83fd03d9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress sites, a common tactic for hosting malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious downloads, likely as a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://leifs-auto.dk/images/file/vorotujoganu.pdf In PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4d03a3326---zetegokuzedotanevum.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210522221004.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943d423e850---lizebito.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/walugazajekakaradozodux.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffb731874b---zenekuledimuwemojoxudavur.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/0aff5b26e6c20fa4de13235880ba2e29/9809379740.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/65878595157.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/45799939265.pdfIn PDF document text
    • https://koratspring.com/upload/file/topesaguxupew.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/vizim.pdfIn PDF document text
    • http://4bx.pl/public/file/8999290766.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4fc8d9209---80492582676.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d67ef7cf7bb---gexusasigawo.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/sakelixuzonet.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/jupinojitizejewut.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/10450740319.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=sawarenai+kimi+wa+shojo+na+no+english+translationPDF link annotation
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE3 18372 bytes
SHA-256: 024ccfffa585301792d1c78391a69863b74aa1c6bb489249ed063beebdb4e0cd
font_01_sfnt_off00011884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11884 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13092 20612 bytes
SHA-256: 465e0e28cae57d5fe3eb789e6352ca6aff72055f26c0b61306c7a4e297d66b3d
font_03_sfnt_off00016f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F2C 10940 bytes
SHA-256: 1dc770ed15345a5aafadf54af51626adff8e60817ca8ea00cd4bcb5a3a53bbca
font_04_sfnt_off00018850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18850 16132 bytes
SHA-256: eb83fb48a2f60ac59fad768156047f025764cad4052c8f34695a9c8dd2456ad8