Malicious PDF — malware analysis report

Static analysis result for SHA-256 a950867418ea253a…

MALICIOUS

PDF

91.8 KB Created: 2021-06-20 12:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 5e61bd6434cfa106b68ce0eb427633f4 SHA-1: 3bd7de2bf7ed4c75e90862ce3ef47a43768c8318 SHA-256: a950867418ea253a1b665fd842d70536e48fdd48a239044be5447871134afa09
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=manhattan+gmat+books+2019+pdf PDF link annotation
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/sfkc5m7bn3e4bljdhnbme3j7od/36328448720.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/62143892034.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/pjc3p3e9hbmgckc2spt3j22eln/931768340.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/eedhdvld8orsvtklqmkn4d45i5/zopifu.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/guvafuwo.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/742ea279cfad37999b653423f19835fc/pinin.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/71959918967.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/24403423ffd744919f9e973d2afec0ab/xugasabodidivu.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609058583a349---lavotufomudur.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b4a419eaa69f23320ae1cc3754097091/wubanupibumaxokeva.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608bee3973b8a---33481828222.pdfIn PDF document text
    • http://reinforcingourheritage.com/clients/0/08/0860c2a235168fe7e4a745c824023bdd/File/sigibexenolebusegepuro.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f81e445c0f---gowogarikovajebenabufovar.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/90869191982.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/ea50f48130e8ea5ef5d104604fa63f5f/tosufepoze.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/21533142592.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001160a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160A 5640 bytes
SHA-256: 722db70c1cf05f42a6a9b901b47b51705423f8264be7332a6ae78fb7dd73c1cb
font_01_sfnt_off00012903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12903 12156 bytes
SHA-256: 8e8422b36eb125f12f8a66c3c464a5f2d6c4be25d70aa2e562bea6ed97ee042b
font_02_sfnt_off000151e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151E0 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230