Malicious PDF — malware analysis report

Static analysis result for SHA-256 05874570f1a6efda…

MALICIOUS

PDF

89.1 KB Created: 2021-07-01 09:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2b15c04cedb5f2d5bcbc93c639093164 SHA-1: c121d8aeee345f973c3c8e2a99b775fee74903bb SHA-256: 05874570f1a6efdaf2adb3cff761e2ec59f55d7c6bb55f64a93670fe0509a2b5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. The document functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories. These links likely lead to further malicious content or phishing pages, leveraging the 'link farm' and 'compromised CMS upload' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/f154a8fa3b0df5cc726821bba6d45cf8/61021374849.pdf
    • https://uppersanduskyrotary.com/cms/files/File/27208257103.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/crv4s1ok12qdcqi9mmbksusoi4/49326228630.pdf
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/8eddf2144ca8fad814102f6ce142f5c0/bopewerekokotuguwabol.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cb38bdf2d---jexer.pdf
    • https://fruzsiflame.hu/userfiles/file/tivin.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/vig2u19g6se1hkpg81o4nu2gc6/37993105135.pdf
    • https://whiteplacard.com/UserFiles/file/9868391621.pdf
    • http://happyland-nsk.net/ckfinder/userfiles/files/91037943697.pdf
    • http://yuhenganquan.com/userfiles/file/20210603101212_1796111362.pdf
    • http://intertexmedical.com/userfiles/files/nifujutizufu.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/ccidracoho7p522d6tmdko9rh7/zaseloraxozabejudoki.pdf
    • http://hurtglass.pl/upload/file/86766867560.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/fbe7317be01c1e428335b2aa3d4c1ec8/vutifivagami.pdf
    • http://stlnsk.ru/uploads/file/37979317941.pdf
    • http://alexlunacoach.com/img/editor/file/fufilitigajatinivugag.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/8e627f08ccd1301b3ec90c0c9a5ca03f/56516001130.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/efv5o9ucbeo6hcbd7aqfm9bits/49105810419.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c49574e94d7---ziwaf.pdf
    • http://humanitool.ru/userfiles/file/62501355210.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/003dc70070a26faa3c77d5f6048720dc/45713724859.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d2f40b96f---veboxamima.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e6471b21b---36834124687.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=i+want+someone+just+like+this
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecb2.bin
8e40e049494af7bee3f728d41d6940e49166c82bef92ea84ddc07dc2011cf068
pdf-font-stream PDF embedded font (sfnt) at offset 0xECB2 10632 bytes
font_01_sfnt_off000104d1.bin
caadc4f6ca736b24bdc6f9f9003e2dbcac0a7a55dc5e053c2d5cbab9cb769a36
pdf-font-stream PDF embedded font (sfnt) at offset 0x104D1 27312 bytes
font_02_sfnt_off00013d8b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D8B 16792 bytes