Malicious PDF — malware analysis report

Static analysis result for SHA-256 01a790b53d6e0774…

MALICIOUS

PDF

94.4 KB Created: 2021-06-29 20:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: cd187ac24acda0b2b21345d970d8f0da SHA-1: 4b87f99ccbfa39a3f84ab687445f7d5c0e06d691 SHA-256: 01a790b53d6e0774e905b05b370c9705e82eea7743747008a2ee310ec9e5fa27
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or phish users. The presence of multiple distinct hosts and the use of UTM parameters indicate an effort to obscure the final destination and potentially track user engagement.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://synerhu.ru/uplcv?utm_term=how+does+a+glass+thermometer+work PDF link annotation
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1579afd03---jokopukek.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/29667384534.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/vefotorijonipenipozufut.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/96569324419.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/b760212e10b2e34bd3cf6bdd6d44c267/83487502957.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098041a9b5ea---40352830961.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/xijaxilalapefubevozu.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/jv5khf26pq1mrggub5avgl90af/zominaxusube.pdfIn PDF document text
    • https://cargobull.cz/res/file/88748812488.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cbe8a34e4e2---sijejumanexuk.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/s03bp6gtjrstl2b57u0vhs9d5v/79693148933.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/sotevomevipisow.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f0b387c7c---12648065784.pdfIn PDF document text
    • http://lyjclinic.com/ckupload/files/43172842234.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/19040137875.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/b98f0e06ad5a73f3b42a927c3219403d/soziwijutajukeruw.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca4e27cba2---xikomenuze.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a9aac3eb0---geguniminuwexibusoxajeg.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/a14i8mpc7tubeom3uo8j89g36e/30064375282.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/6f6b25c7a6427eaa3545f24366238cdd/bisubozinaronaxer.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077dbab58a73---nujorisejepexo.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/20m29tnrrdod3uarcgsk735pf7/pamajokonizalop.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/17705859830.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a14d2138d---xoxapa.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/fecd5326ecda485c9657c91f27d65e05/kajusugefotopuxaw.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_off00010c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3F 10668 bytes
SHA-256: a0fb81e77243341da7deb6c0ba02d8b64a355dfb7cb802f6d7b44273acdbee7d
font_01_sfnt_off0001248a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248A 18052 bytes
SHA-256: 3e56823642d20b40b259411ce78cfacb4f2fee9bff3ab1e18289832bf7ac1a8b
font_02_sfnt_off00015434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15434 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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