Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc296b2d5641aeef…

MALICIOUS

PDF

92.0 KB Created: 2021-07-18 20:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 37a3771f75c2a60176b46df12705db57 SHA-1: 42bbeaf5b6cab775c25273a62b19d777931f48e8 SHA-256: bc296b2d5641aeef4c5706155a013df42396bacc60f0b3d49ced97a406bb86b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing to multiple URLs, many hosted on compromised CMS uploads or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely serving as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160971ed7be344---6626423960.pdf In PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/ratuxopew.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d410f9f2829---kofesutik.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/c385c43a481b2874a7510cca34e4e133/sasezolujozokixosilabub.pdfIn PDF document text
    • http://learningkey.org/userfiles/kulupeto.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae2386f7a8---91226394920.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4078af372---44376398226.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/7ce03106162c8d89d1dce27688b87991/81107683760.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/mapuzalexulixovusefufe.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/4864dacc861c6b74ec6ca864faf0e28a/23720580527.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/84407572825.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/772b7d48196a4671dd27a3402efa44a0/redidujazekapuvuvaxokutuf.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/sugusupegulibaradazigob.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8ac9605e7---fimibukir.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/a7mdgk05j2gsuj8endlga6dpjd/88135776091.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/lotudijumulewawipizezub.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/63561118572.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/1de150e63c1c89fae24d3760a52e5f4c/juvetada.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/xokijuwutazezazawezili.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f086ece43a---wepevozafebipat.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/52154304633.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940d843fce9---filugezuxireb.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcedd04c0c---wokovifetiramofaj.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1677b8d52---mowupani.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/36305929928.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16089b485db2d2---74499211898.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160f0f862b3cf6---wunotomakose.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=gate+computer+science+and+information+technology+2021+by+trishna+pdfPDF 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_off0001024d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024D 11752 bytes
SHA-256: 33d01414e05a0289f1f186452d9b9175f47fbf37a99c0e6313447b709ffc1270
font_01_sfnt_off00011dd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD6 17064 bytes
SHA-256: e0c7f221da8990eb28134e975bc5e6c9c1a157660ced17d1ddbfd174621222c4
font_02_sfnt_off000149d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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