Malicious PDF — malware analysis report

Static analysis result for SHA-256 50327f891e875129…

MALICIOUS

PDF

91.9 KB Created: 2021-06-28 20:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: db1e0cf5ef0cf2d31b5fd182789430a5 SHA-1: 0a356ecdc87c960a2018a70fce67d58fd9a44eb4 SHA-256: 50327f891e8751297b8dbf27e60b3bb6cff4e3147ba5ad51adbc67ca9bb0cd3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm or phishing lure. The presence of external URI heuristics further supports the attack pattern of directing users to potentially malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://archism.ru/uplcv?utm_term=who+is+the+richest+family+in+the+world PDF link annotation
    • http://nowyhotelik.pl/userfiles/file/97948616462.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021062607211880554.pdfIn PDF document text
    • http://darienhigh69.com/clients/866565/File/41482076795.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4acf97597c---bagipafujujabuja.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079bfdd3de24---lifaruki.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/97f46efb372ebeeb0a63f8f914cf9de7/gawelozaranitojo.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/13115995639.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba9e8b099d---38592956529.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc1915bc7f4---ginanirab.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/tigibi.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/60561127986.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/d987ee47b21bf094c498a8d1f1445ea5/fofonovabarafekenuxu.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/finirapiw.pdfIn PDF document text
    • http://firegallery.ru/img/upload/lofuxusugad.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/opv6mbs5vhbn5cgitvo6bmbcvf/jozisusodabek.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c00e7702c33---27324748650.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cf61e3efb---kikisof.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/89639393970.pdfIn PDF document text
    • http://hyperasp.net/userfiles/file/ripezomibolofekir.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/64232850958.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/65qbafhcdoktdlq4v55sbp91ng/tizaxofelexanenobusesi.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/rc6r4bd30076sloh4njatbv5b4/jopevesajotinafefi.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d52c2b8763---99313147473.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/11427593651.pdfIn PDF document text
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/30711728498.pdfIn PDF document text
    • http://greenbrier101.com/userimages/jaritapobedakenov.pdfIn PDF document text
    • 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_off0000fe96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000116ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AD 10932 bytes
SHA-256: 946429786af46082cae81eb9b638a4ee294f15c6220d2ee3445fa983e01c942a
font_02_sfnt_off00012fe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE9 18820 bytes
SHA-256: cbff07edb7ad56d4dcc93259ecd15b366e99f02652ad97dc374d468c8e0fc015

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