Malicious PDF — malware analysis report

Static analysis result for SHA-256 4df00461b966baff…

MALICIOUS

PDF

106.4 KB Created: 2021-09-22 17:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2fd48b4ce365d63b857008fbc12f09b9 SHA-1: a0b9b9395a611e9a8d06791379371da1f7b4d1df SHA-256: 4df00461b966baff4a03cf67243d80fa3ecf5d80afe103be6ececf468daf0544
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on potentially compromised websites or disposable domains, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a secondary payload. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://crysiq.ru/uplcv?utm_term=luke+5+commentary+easy+english PDF link annotation
    • http://35ct1.com/images/ckImageFiles/files/tovox.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/selarewagov.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/vutafowapigaxuwog.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/22121856159.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/1k6hkv4ndm997ijprmrctrvqob/babofiduxazanez.pdfIn PDF document text
    • http://budka39.ru/files/33698909646.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/5413322398.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393947d0414---kaluxokirakupupirarur.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/12981606435.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/bunemewutusesex.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d265bb037e---musulep.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/31322494905.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/d5c5568bdc36c02b40f3e952621e4395/15214436072.pdfIn PDF document text
    • http://freewest.at/45240543385.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/75745993915.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613584731bc63---jupumeveditorupu.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/userfiles/fichiers/tijamujodirevekose.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/99843154907.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18337083346.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/gawivafudalo.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/22652887123.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_off00013b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B14 18176 bytes
SHA-256: 62c12e3aad71ec3b1018ff1119d62466d423b11cc529b422c233bddede380bcf
font_01_sfnt_off00016a3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A3D 11076 bytes
SHA-256: 8956a4c87dc6a3f6ed61aa0dfe078fe606a5a3c6b3c279594b711bce4b1084dd
font_02_sfnt_off000183f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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