Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b44943f0d99155b…

MALICIOUS

PDF

83.3 KB Created: 2021-09-07 19:07:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c2a14ee97714a0e72fcf077088bc8e5f SHA-1: 35aa6738e73f260eee6e17d4ced5ad140c8aa61d SHA-256: 5b44943f0d99155b1fdbd5ca52b7303417c4affbaae8ae97178bfef2525278c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and link farm patterns, indicating an attempt to redirect users to potentially harmful websites. The document body is heavily obfuscated, but the presence of multiple links suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://crysiq.ru/uplcv?utm_term=nuwave+oven+pro+plus+user+manual PDF link annotation
    • http://jullien38.com/ressource/site-image/files/zuwuxajijedosab.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/29629629360.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/7ac0068111213047c0987acb0896009f/90557767901.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/kgtf49l5vkvf7aq814i2tb1iqe/fosibenarebenerobatosu.pdfIn PDF document text
    • http://goref.ru/files/file/82984697747.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/gasumerugarumuritezukir.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///bixug.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610573ae5ca1a---4931220573.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1626619643_c9f327c32a.pdfIn PDF document text
    • https://noddy.nu/images/file/pobepirojop.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/kqntuinf6vldvlans567smkuu4/20548873789.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160cef17a8d90f---legiwudi.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/51249837679.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/92018467060.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d77b0402931---97909235860.pdfIn PDF document text
    • http://candientushinko.com/images/file/silubozidisetumiberurowo.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/mawevonipaxeruvatikap.pdfIn PDF document text
    • http://fitviewer.de/files/file/xoragekab.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/10022466868.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/eea2a5798dbf42ab63d8bf0ef5259c44/92596310137.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1b5f0d46b---39328543611.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16108c3f4087bf---40374506338.pdfIn PDF document text
    • https://rosycaffe.com/file/namaxo.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/72e51ca2c09afa476965c334edb28b0e/jejubemir.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_off0000e0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F3 10452 bytes
SHA-256: 29f6ce08e08cef251f5d98f7eadba75f7ef0e966fac76fdce803eae32f8e286d
font_01_sfnt_off0000f8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B6 18372 bytes
SHA-256: b64947fed2af86f7b7163ddd7554e5d08781fb60139c21fb3d416f5cd0166155
font_02_sfnt_off000127dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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