Malicious PDF — malware analysis report

Static analysis result for SHA-256 2653815d5eed0408…

MALICIOUS

PDF

82.0 KB Created: 2021-09-01 02:26:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: efbcb3bc66d6b562db8e5b71296f9c88 SHA-1: 901a24fdb7ff55444b449f232e04f9ceb813ca8f SHA-256: 2653815d5eed04082065e4658306eb31840159e6ac8514d4d293b262172056c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress upload directories. While no scripts were explicitly extracted, the nature of the links suggests a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f0c0c4980---tigusoxorasujix.pdf In PDF document text
    • https://voyagerf.ru/wp-content/plugins/super-forms/uploads/php/files/93c4685dd2440ebec0b406e3d8f71519/nawikujugigebovus.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092700c1aa29---pomumapab.pdfIn PDF document text
    • http://zenithmetals.com/files/jusiwirikadiwemo.pdfIn PDF document text
    • http://short-story.ru/upload/file/mudadutuwusago.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/170ca018d0aefd509ae0f0ac2c98fdda/4037533525.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/kijarutisike.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a483caddba6---taloxufeziperakaziter.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/kasorukegejavogerira.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d43b18a3fc4---96559027963.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/44682434565.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f1426b126---kagikixelaruw.pdfIn PDF document text
    • http://laduses.nl/image/file/39596886008.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/4e20b789f4d33055c4418f2898981119/27028033186.pdfIn PDF document text
    • https://slaterlighting.com/wp-content/plugins/super-forms/uploads/php/files/9ea5539b739d02eccd82b407e73fc60f/31951259189.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/mubisejupeduvaturi.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/jajuzefixusubudiwul.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708cd68627a---2446764405.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b50a80e52---zoxemigod.pdfIn PDF document text
    • http://capital96.com/userfiles/file/pevap.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cec221480f---murimipipiwafekelidexosun.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/22949291870.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1609be9b9a356b---wujunolewe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=2+owls+guesthousePDF link annotation
    • 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_off0000db02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB02 10140 bytes
SHA-256: 8fb647513fc647c4b7d3c3b9c37c7041510c783ac49b372655a6dcdd17ee0ef3
font_01_sfnt_off0000f200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF200 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A12 19460 bytes
SHA-256: 48f65b48e795d95b879921558165d1e84987c729f087a9bb1ade31f29212d4c6

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