Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ab84047781fb48a…

MALICIOUS

PDF

80.1 KB Created: 2021-09-12 18:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6a926f15ef568563798a76def9f9da0e SHA-1: 08126dfd1177e96f58d390f109ef150a0872d33e SHA-256: 3ab84047781fb48a479919e60bce77a66bcbfe886238ae54abf1dc217927a010
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and a high ML score strongly support a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://sanarina-coaching.de/ckfinder/userfiles/files/48307194680.pdf In PDF document text
    • https://supermagnum-bg.com/userfiles/file/wojuroradesovedonufov.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/67708317551.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/gifunoxuwuju.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/milizofirakowelesi.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/56653486719.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/mutipuxukigosiwarajiwo.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d2b2fde93ac1e1ee763d9e4e18edf658/wefuzug.pdfIn PDF document text
    • https://zzwgjx.com/d/files/newidawezoledazajogutaso.pdfIn PDF document text
    • http://pactolous.hu/upload/file/jazudevekixavexuposibal.pdfIn PDF document text
    • https://clubon.top/uploads/files/99783791184.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/biligajefafosala.pdfIn PDF document text
    • https://viettrungson.com/media/Files/dimotek.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/31658898934.pdfIn PDF document text
    • http://maxbrio.kr/files/files/fofopetirime.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/c9da60cbd086e04fa6e249d195c7c531/merux.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/37f8396d531ff2398f8c2607c94d5c3d.pdfIn PDF document text
    • https://btegypt.com/file/95315292465.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/wegazefaxatababutobite.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/wofuzeguzusepixerejof.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ced444049f---vopogobumapoxevapag.pdfIn PDF document text
    • http://mardeestilos.es/fotos/file/46517881849.pdfIn PDF document text
    • https://epiphanych.com/images/file/65318055831.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/fefikofeta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=stock+camera+app+for+androidPDF link annotation
    • https://b2cdemo.tickets.com/content/files/50890634233.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_off0000d271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD271 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA83 18124 bytes
SHA-256: 388fe85e90627aa543e15e7103f40444fe93c5b4fa5a2ac93dd6ffb52d9ebbc6
font_02_sfnt_off000119c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C1 10736 bytes
SHA-256: 2d6c5c1a27b0fc9d64f3265e2633a3f676a0e207eccf4dbfc76c1225d3b77ed7