Malicious PDF — malware analysis report

Static analysis result for SHA-256 512cc6dcea0ab66a…

MALICIOUS

PDF

81.7 KB Created: 2021-09-05 05:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 1ffcde9ae403fddc7f7645cda5b62c9f SHA-1: 83a5d86db3c5bb106298749497b747d4a6944c9b SHA-256: 512cc6dcea0ab66a936cbd838b527f2cabe19f235b8987c9cd35d5367f0317cc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to prompt the user to make a phone call, consistent with callback phishing or tech-support scams. No scripts were extracted, but the presence of multiple external links suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://medvor.ru/uplcv?utm_term=importance+of+lesson+planning+for+teachers+pdf PDF link annotation
    • https://ajur.rest/uploads/userfiles/file/78049024919.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16085208a0feb3---zofisavomurorabulov.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/90940308149.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ak83du0s670bk2s0vkro78c4o5/46939816297.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/puninuz.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/61432919719.pdfIn PDF document text
    • http://bluenanum.com/ckupload/files/34800475684.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/riguwifan.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/3910938890.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/13341105933.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/kitowizetob.pdfIn PDF document text
    • http://gardnersunited.com/clients/e/eb/eb3320446930dd457027df34457c622b/File/67690404644.pdfIn PDF document text
    • https://hostessima.pl/userfiles/file/tunidapisegojoribar.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/lazububifedoxevak.pdfIn PDF document text
    • http://alhs1973.com/clients/64426/File/fububipobubovesatobelip.pdfIn PDF document text
    • http://high-keenltd.com/userfiles/file/5752320805.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/10475e1035f4dd36c5193a86785edca6/regokojunoxisixizeza.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/mezefaxufuleg.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/54504116579.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/mojolukarudofijen.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/19346374762.pdfIn PDF document text
    • http://arablift.net/userfiles/file/xinikagoxomagin.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fddf8ec832---waserejexor.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/2021830175197577.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_off0000dafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFD 17344 bytes
SHA-256: 6fa75358a8f6cca8361c2b0ce50fcf97d9ecd24134239900a23e236c28673990
font_01_sfnt_off00010805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10805 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001201c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201C 11016 bytes
SHA-256: 300fb4258d69ab46445994660bf079c3e127124e4bb1e3caaeac43eaa6888493

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