Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aa7abda96806408…

MALICIOUS

PDF

90.4 KB Created: 2021-09-17 20:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 9009a31d55608ebffc24901d844ef41f SHA-1: 3a831541d3c8efa34360ff20469e9784add7e83a SHA-256: 1aa7abda96806408da27902fd521f9c7bc6de247074e6f0907979750545f6349
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and URL patterns align with a common tactic of using malicious documents as a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://cructi.ru/uplcv?utm_term=app+para+duplicar+foto+android PDF link annotation
    • https://universitecentrale.net/uploads/FCK_files/file/24949624616.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/99635145640.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613421070bf0b---saxivuwexivixufazapemider.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/zizimagum.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613852323d8ea---49661857472.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/dududuwalulejez.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/dawagonokofadob.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/lezodiju.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210910060820.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/3409082112.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613a35845c91e---dekujunesegexesadanexi.pdfIn PDF document text
    • http://staropolski.net/Upload/file/71719819040.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/76839648721.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/ad2266f73c99045863223c18429cf31f/robironelixokezufo.pdfIn PDF document text
    • https://digireg.com/upload/60015689007.pdfIn PDF document text
    • http://langyupharm.com/upload/files/51850510659.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/80682401485.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/15419584406.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/zubupinufesunelujesuj.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/50555392695.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/vunatewimupixidewinesaxo.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_off0000fc49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001145b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145B 18748 bytes
SHA-256: 2b3995b7eb503c86e39fe5559621ade4027d4688e6783cf473f172334959b10a
font_02_sfnt_off000144d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144D2 10392 bytes
SHA-256: 905f17790dbcfec420019ce969d64ba4e2715d8f8f4102a8933790760c95c968