Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a51b0d1d5a5292b…

MALICIOUS

PDF

83.2 KB Created: 2021-09-01 02:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 51f430b520330792350f1bb4215bdb72 SHA-1: b9fc2a4a854cd6ce29b04942b7d17c2a3d531b26 SHA-256: 2a51b0d1d5a5292b0f63145ec3a24df266adb2d93cbce23c6629e6a70af29cdf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing users to multiple URLs, several of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links on potentially compromised sites suggests an attempt to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://rajatotogroup3.com/contents/files/7631435523.pdf In PDF document text
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/wogakajediraziredinebafa.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b2def3a75---vewokex.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/16035858555.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/48442565933.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/a2jlhonstcboufoqbsqjp5njeg/tajizu.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16110b8f70c562---wupivogagabavugubowo.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109010601186592.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/lunaperexonebuwivunenuwos.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/kekobizu.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210529070448.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021081018120173499.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/rufoxezanikeda.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/5b7722aacc91d6ab10b7f936f3349604/nibanekeketavedif.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16078dc901b0c0---40439468074.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/linelivubijafajokunuvus.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c059addd1fb---tufiletadilubujew.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/d82d9cabdf078debd505c62fdde7bb95/bokikuvakig.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/66387407126.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/likobuwezob.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a0e5425cd4---jumiforiropazofexak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=separation+of+variablesPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF263 20220 bytes
SHA-256: b17c123d883364b05ac620688364c051c8926fc1a7ec9525c5a6eaee387811f5
font_02_sfnt_off00012713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12713 10632 bytes
SHA-256: 3a7d34723cf3471dad32cf7481ee7307b979b1e177758433dd2c07a6d8166db6

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