Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6af0293700598e9…

MALICIOUS

PDF

70.3 KB Created: 2021-09-26 22:28:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 76a120a493e840790ec6f6204676cb45 SHA-1: 543a2a49ede3ad29db4ef6943d81235ac58d46ee SHA-256: d6af0293700598e994e2744cc23690e8eedb395c9c2b5d8241728fd384fd2790
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The presence of a 'callback phishing phone lure' heuristic suggests a social engineering attempt to trick users into calling a fraudulent number. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://oniceh.ru/uplcv?utm_term=mws+nimc+mobile+id+apk+download PDF link annotation
    • https://www.institutvzdelavani.cz/files/mojuratow.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161432a156e27d---29479833329.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/82960077696.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/kaxefavodegivuwiwitariwa.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/aed03dd0eb100adfa0a0143091ac7578/zufavovamemexuluwa.pdfIn PDF document text
    • http://tabletopad.com/images/file/86123221170.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/muzojirogivudililuposof.pdfIn PDF document text
    • http://chamdure.com/DATA/files/84744212504.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/93283033449.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/e8e0d944afb879fc0b72efdd36d2d7c6/13704324856.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/mowiganokaxesum.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/28002948282.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/34505033730.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0eab572b2---57755816539.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210911212723.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/7550761744.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/rosokejasinidipuwoluvo.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/89680093205.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/26535989577.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/dariviresubuxavuxeg.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/jobubitozalezividomatik.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16146e3a5929ec---74075853763.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614c413dd4838---20017029726.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613aaa8847871---zulazopefibajugomitenebe.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/32455835939.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_off0000b4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A8 10788 bytes
SHA-256: 855f2ca9dd5583eb100e4802f7eb0f3e3887c1eb5ecba82a2a19e1100019a93f
font_01_sfnt_off0000cd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55D 14488 bytes
SHA-256: bb6eb1fe89edee51fb683ab84023f96d604f71508bc46e70ceaa835f5a70bd8b

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