Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4ab0d2e6739267f…

MALICIOUS

PDF

80.8 KB Created: 2021-09-09 12:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 21aa8097abc1f00c61476f873b4e03b0 SHA-1: 720a77f06dbd657b51a195fdc3fb168b2c3b2046 SHA-256: f4ab0d2e6739267f82358bbdd9159e46afe0b0e8d6accf9c31bd5ba8315a25ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and detection engine findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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 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://infrive.ru/uplcv?utm_term=games+like+little+big+snake PDF link annotation
    • http://domki-kopalino.pl/pliki/zagepudojos.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/45421431445.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/5fec6f5ad6d315cf9e5c72151e15622d/putawojojudo.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/siduzos.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/86349673878.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/73361158670.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/bexifu.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/21997984602.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/xadapan.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/5460236457.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/fofelugusogib.pdfIn PDF document text
    • http://gewald.ru/content/Files/8515095329.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613076be4bde7---linajikisujizuv.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/34203409452.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/73831756600.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/tikotafir.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/22868512717.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/lebajipunezorujogo.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16133cdaaf2d2b---17631024718.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/48602204538.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/nobubasuliditibokupena.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/deginanoranijuliji.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109050631592667.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/52d075adeba25d1eca3ac7ec1066d34f/biwefuku.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-9/20210909122647736464.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133dc491172e---56525773315.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_off0000da84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF296 16852 bytes
SHA-256: 392e82742e1ee1b68ce716293573bc517e7aeb682d965c69a4eae12553cd6ef4
font_02_sfnt_off00011e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0C 10504 bytes
SHA-256: c6bfeb0e1f3341284dccfeb5b6692038f3ee755cd0a81c15be476b4a5a9a4f7c

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