Malicious PDF — malware analysis report

Static analysis result for SHA-256 6916494fa30073d4…

MALICIOUS

PDF

79.9 KB Created: 2021-09-18 09:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4328b871258ed5cde6bdd7ecf941b1fc SHA-1: a24a8878efc229613cda536ccff974ca56741203 SHA-256: 6916494fa30073d413c4037b9db041e9acaeaa327b1378188dba5abde7b600e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to compromised WordPress upload storage or disposable hosting, characteristic of link farms used for phishing or malware distribution. The presence of external URI heuristics further supports this. Although no scripts were explicitly extracted, the nature of the embedded URLs suggests a mechanism for redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://irlanc.ru/uplcv?utm_term=best+emulator+for+pc+to+play+call+of+duty+mobile PDF link annotation
    • https://sharjahcements.com/images/bulk_images/files/katuwokipajozofa.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/xexexizebedopi.pdfIn PDF document text
    • https://csodamalom.hu/files/files/kamisewuvisewefoju.pdfIn PDF document text
    • https://hotelcorona.ro/files/gevixepoju.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/53874634569.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/71030024368.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161308e92407c1---15323612625.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/7258875835.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/lelapux.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/tonekitidoxu.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/vuwelod.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/hbsm0k82bs3n69klss20o0q014/bigiragigulosorakob.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/lajujagikodebolamixofezok.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/pakawa.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/15922162945.pdfIn PDF document text
    • http://elitvorota.ru/f/file/29201288213.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16138351509a9e---42086629167.pdfIn PDF document text
    • http://demo-enriquemora.shopcloud.es/ckfinder/userfiles/files/94068670324.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/5a60b3ce3411aa162f2a4f2230112ac1/29331858188.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/28529415297.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/ludidipekutepegano.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/51401998184.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/6ef3b72b0bec3e68c0575f3f2b9d922f/63242235358.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/62092741750.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/96366429158.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/24012254384.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_off0000d365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD365 11084 bytes
SHA-256: 02d375f79aea88a048e23e5547f0cf6649589ae9e54313b12ce2b6ae6c34ad6e
font_01_sfnt_off0000ed13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED13 17148 bytes
SHA-256: 919a335aef6b7ff21dbcd7c960a2f6eaa84878d071f0690ebbef0647553a6f9b
font_02_sfnt_off0001197f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1