Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ff42e97f642d2c6…

MALICIOUS

PDF

73.2 KB Created: 2021-08-14 22:15:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2f5c249558fab6b03b802ba6e3b8bd58 SHA-1: 59a1380e5831f087b7bffe00bc41e6187bbe4230 SHA-256: 9ff42e97f642d2c6d277b0e06b2a9e8288faf1004afce37312ce00cc64645601
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised WordPress sites, suggesting it is used to distribute malicious content or redirect users to phishing pages. The presence of embedded URLs and the nature of the heuristics indicate a likely spearphishing attachment used to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://laborke.ru/uplcv?utm_term=how+to+reset+a+gate+motor+remote PDF link annotation
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0754aa9a7---24760994116.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/59175323386.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/1b4d9ab6d06f230883e44b7acf971e00/vovijaxofapatimatebosa.pdfIn PDF document text
    • https://areicon.com/images/file/33168807195.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160957f0b5ac45---raxote.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/84131000617.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ffdc044819f---nimokalanada.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/62898511118.pdfIn PDF document text
    • https://primer-spb.ru/files/files/tujuwazatoguz.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/26581967624.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/58212107539.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/penuvaweg.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/pogivoxosiwifeb.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/c3a9nsigfrvtg7eo8ep26n6u52/wafotojunixatevofad.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/eac54ea7bd5ee8187d335f0fda3367c6/62244257361.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/93770154299.pdfIn PDF document text
    • https://coatielectronica.com/files/12096208860.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/numixumigusidelaw.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c874cace42---mesaxagumutilamine.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083d844b2dfb---figovisawefejoxav.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/mozepuvatis.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/lotedif.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_off0000bce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE9 10288 bytes
SHA-256: 844dc4234ae70e86b6e03c0f600105fd26a81311b2df225454e138959a3b946d
font_01_sfnt_off0000d42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42F 16536 bytes
SHA-256: 2f90fa6106119a971d4e0c603e05ea48a35171975e88cb2d4d624916281daf13
font_02_sfnt_off0000ff2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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