Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c7cb7b42096642c…

MALICIOUS

PDF

93.4 KB Created: 2021-08-14 05:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 4bf1c5fe44a6976c1de26762a1312609 SHA-1: a941d129ca1857527ae330f8f265b4f6b1df03d0 SHA-256: 4c7cb7b42096642c021156dbcc63a6f7590d1b3c5eef064e0fa4ececa216d508
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS upload storage. The primary purpose appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://kwong-cheong.com/userfiles/sonogakagakunosibi.pdf In PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/19487617542.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/53370500557.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/5897af4d75074b7a58f5aafb40acbca5/durexajosisun.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/vuwixo.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/81914114309.pdfIn PDF document text
    • http://cbafjvn.com/uploads/userfiles/file/kagenozajede.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/5v5086r0q0ri15oaevdprkdc14/mejenedigaduzelaluduv.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/karazojonoxuvosebef.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/voxawatoxejodazupeduvese.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5380b4bda---38438306349.pdfIn PDF document text
    • http://apcmagon.com/userfiles/82163174918.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c51a30cdeca---23317021454.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/miwupaziruzomafuledi.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/mukuvulimekukofesapudaze.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/80471693832.pdfIn PDF document text
    • http://grafordexstudents.com/clients/0/05/05b3dbe7dd9dc6f92b523d2b721f2ffd/File/75010292450.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1ba910c3b---xevifaxa.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/fobudajapisifakirod.pdfIn PDF document text
    • http://southwest66reunion.com/clients/f/f6/f6f8b7bd17d60304c359e527a2c43449/File/74860032521.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/megejujonozewinud.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/85633734565.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/e32e84965ce61f1628b1088631600132/97987139519.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=muhammad+the+messenger+of+god+2015+full+movie+download+in+urdu+720pPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D1 18260 bytes
SHA-256: fb8efb4cc6d099de599b5f685cb13466d6712f9b461f7ae413ee4ab5886ec504
font_01_sfnt_off00010121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10121 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11933 18740 bytes
SHA-256: b740357794122fe36c69e6cbe8fbf138bdf7d3cabf3b60754e775ff2a1b45648
font_03_sfnt_off000149e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149E6 11668 bytes
SHA-256: 38332f2fa543437348c5537acfd7f897b26d539ae54eeb6d5689e66a567014d0