Malicious PDF — malware analysis report

Static analysis result for SHA-256 924a10fecfd01f9c…

MALICIOUS

PDF

69.5 KB Created: 2021-09-29 05:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5cb14b6e5af67895462af7a79a0bade0 SHA-1: 8f1dfaa693bc6e3b124c9142a63c23f37a232cdc SHA-256: 924a10fecfd01f9c53f59e4e2ce7095d2697a416925b854f1f464947b69dbb40
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The primary purpose seems to be directing users to external resources, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://laborke.ru/uplcv?utm_term=how+to+block+a+particular+site+in+chrome PDF link annotation
    • http://etcad.net/np/upfile/file/15085305198.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/82391638790.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/fa0b854e7d2f3bed1ef1335eb94d7817/37217025360.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/10836762051.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/lenubepubuwuzolujapikubam.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/gifuwudajukiledaxetu.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1615322c8982a9---jidupekijesegozikiruj.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/kulen.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/mejomidedukevej.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/53807152400.pdfIn PDF document text
    • http://chongros.com/userData/board/file/19966253851.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/34378687016.pdfIn PDF document text
    • http://potya.com/fijugupuvi.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/30454393843.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/47613509246.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/80242247394.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/nesogebogisuzekekutaki.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/0de8a47eb6d70545d5791cc03d86ec92/34406123888.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/54482194392.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/28560489881.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/1436871891.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/vodagijefurubijirovin.pdfIn PDF document text
    • http://sunway.me/uploads/file/151033222264.pdfIn PDF document text
    • https://patriciogaete.com/upload/file/puwoxunaruvaxozapamaw.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/30688677632.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/26596747180.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_off0000b199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB199 14844 bytes
SHA-256: f4b24c201b24c434f2851138ca23a3ad999f4725de589a829943965fd3578997
font_01_sfnt_off0000d6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EE 11048 bytes
SHA-256: cd76413da6ecdc3e7a386da0fd4e8f9ad31f278d08bc69f11414cfb4948ee8fc
font_02_sfnt_off0000f045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF045 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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