Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2ebcedc9ada3cad…

MALICIOUS

PDF

74.6 KB Created: 2021-07-04 03:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8fdff7a3aa7ca7d1b79e39439896643c SHA-1: b38d7509d07d45062a0efacbdec3443d2737f5f8 SHA-256: b2ebcedc9ada3cad9d3fbba2861e223aad663c100d8e64b30b65baf47f2fe556
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to distribute further malicious content or phish users. The presence of multiple links on disposable hosting and the use of UTM parameters further support a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a47918b8f86---59607246907.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/raj9op0b0ahqjaaahfs6g372o0/54618293708.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160963b38415c8---jesitonapu.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e7ccd9477---62675339537.pdf
    • http://fkhd.cz/data/img/79420875596.pdf
    • https://bestcoloringpages.com/userfiles/file/227220906.pdf
    • http://hoteldazegliotorino.com/userfiles/files/61640833822.pdf
    • http://dhs1970.com/clients/9/98/98bceae81adeaace0f0761aa7b0d12fa/File/kezizowuxizozusub.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/4d6858fd47a9ddf823fc04853edc5b49/vewadederapekebuwis.pdf
    • http://honda-vo.com/upload/file/xogulifizigefud.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16093b1a87d99a---12178499659.pdf
    • https://evpersoneli.net/ev-personeli/file/54943282012.pdf
    • http://prociweb.hu/sites/files/file/71413670791.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073d0a5bac76---86905071850.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da71b5d539---pofovuzeputotavojoto.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05e1bccef8---77174716558.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1bae28e6c---84209337120.pdf
    • http://washchienluoc.com/upload/file/bokefutudifirakivo.pdf
    • http://vnplastic.net/upload/files/vomudasaxevigep.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa4a8e76ab---73088497906.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/c3b380ed8eb1a13304d9cd833e317e52/46120392837.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/551af87e65d19f91748122617e488758/9350939586.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=old+english+pitbull+terrier
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c57b.bin
045528b2246f053a1cdf2a56f66e62357c261ead453916bf0faec36a21b4a738
pdf-font-stream PDF embedded font (sfnt) at offset 0xC57B 15592 bytes
font_01_sfnt_off0000ed67.bin
07bed78550157a6f80a5cea19e03ff71bd6fa89ecc7a96578c8adb22c6d5e8c7
pdf-font-stream PDF embedded font (sfnt) at offset 0xED67 10656 bytes
font_02_sfnt_off0001054c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1054C 16792 bytes