Malicious PDF — malware analysis report

Static analysis result for SHA-256 50b4780940e8f224…

MALICIOUS

PDF

91.0 KB Created: 2021-08-26 00:55:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b281b9cf9be0fa2da2624a53548c1162 SHA-1: 8f55bf7626b9429e0ba9605ff913aa88e499d2db SHA-256: 50b4780940e8f224d82150a534f5b0a3582b333c0f869aaa61bb10d4c3ff967b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. No scripts were extracted, but the nature of the URLs and the 'link farm' heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://philabc.ru/uplcv?utm_term=200+greatest+pop+culture+icons PDF link annotation
    • http://apartmaji-zunicmile.com/uporabnik/file/68988314934.pdfIn PDF document text
    • http://sassyissy.com/survey/userfiles/files/larodonapupamafarawib.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1417acc88---minelakavevowimojilu.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/pevofonimaritaluregisuzex.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/daxupoza.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/799188443fa488039723addae0df1c73/wisasile.pdfIn PDF document text
    • https://camerabentrenet.camerabentre.vn/ckfinder/userfiles/files/kiwusokufelexopiboma.pdfIn PDF document text
    • https://lompatjauh.com/contents/files/93072261214.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c947be61e98---wodomevudanokawajavomidu.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076047149d48---pufudoxotisomasefanefusus.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/32709449898.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/18328350515.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/juwitozatugefeveworepiwub.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076e19d1cd4a---79922488665.pdfIn PDF document text
    • https://chptravel.ir/data/file/ruzebilukoruketijirili.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/21028767299.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/b16b38bb4b08059a3bad82588d09c474/15211315840.pdfIn PDF document text
    • http://ahs1968.com/clients/d/dc/dcea35c349c70fb55dca458fc6558ff6/File/1549802284.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/zedanixokajik.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160acaecc710d0---62001106882.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/181b0aad053bfd18871e1ef01adbd734/79019440803.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/58610939366.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/20218513611.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e5fa3b990---75238948574.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_off0000fe30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE30 17496 bytes
SHA-256: be2f8563e1456cdbe999279a0b2c2cae14381d5fc7abaab0b966d582fd30a729
font_01_sfnt_off00012c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C08 10792 bytes
SHA-256: 1174016944906f6578e0cbdd86f10d3ed8b206f92fe871eeb2744c1497983003
font_02_sfnt_off00014507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14507 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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