Malicious PDF — malware analysis report

Static analysis result for SHA-256 61b36bbdedddaa78…

MALICIOUS

PDF

83.9 KB Created: 2021-07-01 23:15:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1e3b13c97af9fbd6fca495b741533525 SHA-1: 1501497b4e92f74d18213a1124a76da48a43e9cd SHA-256: 61b36bbdedddaa78e0bd73a342839f7ae07aac0da7da1b6c7d7c3922dac3164e
156 Risk Score

Malware Insights

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

The PDF document 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. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://chcial.ru/uplcv?utm_term=transverse+waves+on+a+string+have+wave+speed PDF link annotation
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/55c0n15c4332ko4eev3lcq143q/71284304093.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2c88e7deb1---keropozezukugubukugusopu.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8c6e43d08---jegimixuguvosozel.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4def3e68f---leporobuniwaku.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/94134829427.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/1kn979ldcud2sv620g4skvbko6/3556868535.pdfIn PDF document text
    • http://home-delighted.com/user_img/files/gofexepogapesikined.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/nowekixojefidivulovu.pdfIn PDF document text
    • http://adbuffalony.com/uploads/files/rerasejabamiwa.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/3125403750.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8867b8f48---36504670256.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/d8e805becb306ad8fae059d52ab343fe/suzug.pdfIn PDF document text
    • http://centrons.com/uploaded/file/12654041060d2e0bfd4a9c.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c43f20c5c5---67907262308.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a78c84b50d---2473879631.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a26f2f60b---74929177792.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/b7864c92d7163cb27d0df8fedd3cc9c4/35623300627.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607dabf60f0e4---wiluwis.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/vazutefoxakalukiropuga.pdfIn PDF document text
    • http://jameshamiltondds.com/clients/6/6c/6cc67b5d90347a591bf4e9c0b97a5143/File/fasimokidobiviliwu.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607cd114a72db---susogujawenigakeritufo.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/6238bec30b80a1e1d7a8a9daaf9dd824/fesiverefow.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/10077842890.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_off0000e359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE359 10740 bytes
SHA-256: ff4c9bd803fb48ea511a2321d2f73ebc16335217b6c7006c1c39f89c1a275dc6
font_01_sfnt_off0000fbd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD4 17636 bytes
SHA-256: e4bd8140779a575ae7647fd5763a2797aff04c56a1d5d35a73688fc37bcbe8bb
font_02_sfnt_off00012a49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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