Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cf4fcfc3dd17cbf…

MALICIOUS

PDF

152.1 KB Created: 2021-08-27 05:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 79a02ad090c020fe2fd9b60c4ffcb2f1 SHA-1: 37b9de6af20dba8a92d1a93729a4338f5e68816f SHA-256: 7cf4fcfc3dd17cbffb6054f914c64d6d145734a7392f097687439bf0df006d00
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to compromised WordPress sites and disposable domains. The document body is unreadable, but the link farm behavior suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://skupka54.ru/upload/m/pezaxurelukapeg.pdf In PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/f4c1ad086930d51518e007783e43ca4d/kevexudoxeroroxarutogasuj.pdfIn PDF document text
    • http://ocean-ex.com/images/blog//file/xudovejitilip.pdfIn PDF document text
    • http://peoriamayorprayerevent.com/clients/1/16/166e3f524b51ec168ebfd48f86188a1d/File/13150191779.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/makeku.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/1580809676.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767d83867e4---jufitelelisepewa.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814c59c524c---mubeguperelanutugelip.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/6bgefodpmuffph6kj2dk0ri84r/20624659946.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0049cc890---bibasunoniruwuz.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/0a5cb68ed80eca5db7a8a1ddeb050fde/tonom.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/4agl7vomel795694c3dcapvl8t/zogogoxirufubatagazukul.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/62834827597.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9d189981f---lofepenosinogimifogex.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/9820124327.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/58407855242.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1611a5b28ed5bc---sazixerime.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/13406089311.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/41776851440.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/84435393241.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dfc9c2ce5---zomeba.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/wefujopa.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/52395255438.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074bc618f55b---bodixuxibubakedebasawagev.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/pitajamaloxijuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=the+new+grammar+tree+book+7+answersPDF 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_off0001f481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F481 10748 bytes
SHA-256: c07fc84a08e4b3479e517d2c10863261b45e90a84678467c415f1fe8934b8471
font_01_sfnt_off00020d2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20D2E 17128 bytes
SHA-256: 347098f2abf6e5b19facf56e2177a08ffadaa106cba0292d1f3cc35d78ddcf03
font_02_sfnt_off000239de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x239DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1