Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2964930a7e0fa26…

MALICIOUS

PDF

90.8 KB Created: 2021-07-15 10:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 288d1930d22abd5a88cdba35e46ee55c SHA-1: dce37154d2bfad0059bbcb6395c693b5fd3e09cc SHA-256: c2964930a7e0fa265a99ada952088a13ee7474ecb3edc9ba1ab418e553b29570
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://laborke.ru/uplcv?utm_term=what+does+huh+mean+in+a+text+message
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609df1db425ef---40875851051.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/bec7999abe3d5c732790c7cb525225d6/70076049983.pdf
    • https://mmszke.hu/files/file/fetawexag.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b1875efc7---noluxuparo.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16075edc97b986---86227346563.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c44c49b0888---1059322114.pdf
    • http://aceonlinementors.com/userfiles/file/xovuxepe.pdf
    • http://esejsc.com/upload/files/fufifotorifagowozobu.pdf
    • http://fsoa.cn/userfiles/file/pupudopobut.pdf
    • http://kulturazebrak.cz/userfiles/31938018558.pdf
    • http://clinical-pain.com/pds/userfiles/files/16175878984.pdf
    • http://hnc2.com/userfiles/file/povivepejujufozufasuraxe.pdf
    • http://citescolairedeledit.com/include/file/35668076573.pdf
    • https://global-brand.net/userfiles/files/fibasalagovi.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b78129cd926---fudubigozamuworififi.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/2c79961615b54c6f05e34c844416046e/85230771976.pdf
    • http://studiomalpocher.it/userfiles/files/kemowi.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160875f15e058a---bojelewikilugubafa.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/c30772fb1da5ff4461ca1fea0ae6a7ee/16662161489.pdf
    • http://wrtour.com/FileData/ckfinder/files/20210618_6C3D8FCF95C1B9F5.pdf
    • http://greenbrier101.com/userimages/wujolomaf.pdf
    • http://limeitec.com/upfiles/editor/files/7220093592.pdf
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/sigenuji.pdf
    • https://bobecoingatlan.com/uploads/editor/file/taguxaluxo.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/ab056e16cc23dd9b47e9ed9459243ee0/femaranoxobezebobudobax.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b40efa0832f---favudar.pdf
    • 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_off00010039.bin
5ba4aa0b11d21ac64461be1138f1964a060663596c9fc0c05e7f4d7030b45dd2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10039 17248 bytes
font_01_sfnt_off00012d56.bin
f26b0375a47c08da3bf5f3d9f7e9dc080981189cc4ebff296b73a5989881d492
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D56 10744 bytes
font_02_sfnt_off000145b7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x145B7 16792 bytes