Malicious PDF — malware analysis report

Static analysis result for SHA-256 2101c15a1a7b2dd1…

MALICIOUS

PDF

99.6 KB Created: 2021-08-07 06:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 9c7a95738b1afee3a556a7ff1b94f4c6 SHA-1: fcc0c28f2266419839c095c0f99f0bfcd2560e50 SHA-256: 2101c15a1a7b2dd169af9b243ebdeee169428d0aebc7c30b36ddabb6292562a1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other potentially malicious sites, with a specific lure impersonating Facebook. While no scripts were extracted, the presence of numerous links and the brand impersonation suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=como+ter+robux+de+gra%C3%A7a+no+roblox.
  • 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://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ce48dd19a83---96031231737.pdf In PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/2f05d088b979e0140a66d98c0ccaf4fa/lakefifisake.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/7e75preargud4qh6i050gr32sk/mexejamasa.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/11605732593.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/59064334550.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/gokoxiroziduvofe.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/vevuje.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/foweromitisigenibag.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/93782647013.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b919db4a1ae---moxulasowiteb.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/5dhva1tk18j4vuln2peq1b9mq3/leweb.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d07d71af6e---zegogetano.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/besafuvafemaxokadekoxi.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2f49eaf67---34233941465.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/45fa39ad6759886c2e0bd10c1ff47edc/7736465845.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/zozosi.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f709a2c3622---muvidakatimiketu.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/dabovizojowebatageji.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/10462572470.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021080416051797.pdfIn PDF document text
    • http://midel.me/userfiles/file/90089171116.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6287a15aac---wipobapadatogo.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/f9d56edb9849c6cb3f4d0f641fe166e9/89056158760.pdfIn PDF document text
    • http://mosjob.ru/images/file/dabemaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=como+ter+robux+de+gra%C3%A7a+no+robloxPDF 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_off00011d4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4F 10900 bytes
SHA-256: 2a0fb7818e861d658be5dcd57d408a86b9a8314ed0973004f0d961c326d8993c
font_01_sfnt_off0001365b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1365B 19124 bytes
SHA-256: 9142c6f6dada0c7d9ba96e1c68808b993b9c6bebef5677c6ce86a40a4bb0a057
font_02_sfnt_off0001660f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1660F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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