Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e543be52bbeed3c…

MALICIOUS

PDF

85.6 KB Created: 2021-07-08 16:00:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e59cb44a673ccc8813b3956b37681171 SHA-1: dfe960c320d9654392e6cf257627226c8812f24c SHA-256: 9e543be52bbeed3c641da2e3e7ecdc2a8d5f8325d210242d507baca779ac074f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a link farm pointing to compromised WordPress sites, suggesting it is used to distribute malicious content or redirect users to phishing pages. No scripts were extracted, but the presence of numerous URLs on compromised infrastructure indicates a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/n3lgfb7i1t9cs78sh9d05u8m89/jabaxomojesokonuguj.pdf In PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/hg37c0n26p7i8bio59jj6u85on/1695952322.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/volavekurakeda.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5fe63f4e4---gegulepofanuxezusane.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606d06cf8e378---37333110852.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-14/20210614162758640152.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077034977f51---giwokikelufoporemogoki.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/2a1db9a8bf5b8eb4a6b15ce3e25cb76c/64698071984.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbbbb859417---96302971033.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/38173262173.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/d33fbd4d2e335b1c381366d6d5926277/44901709497.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a98a2f12f---budogigodokoxopaz.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/nazosusobekabupazaja.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/wufedikifubirur.pdfIn PDF document text
    • http://newcastlehigh1967-50threunion.com/clients/43248/File/nafexupegominozatilodi.pdfIn PDF document text
    • http://toshiba-center.ru/uploads/files/rotemokitevulimifovina.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/5a3b910384843d1a7932e18f74dc7591/maxogeliwutawugiwimobon.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/5u7jcv6f7vtlttcukjd1tkb5su/16811169901.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/34493302043.pdfIn PDF document text
    • http://quaint-house.com/15861531296.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608422ca977b0---24933655238.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/fitowiparedo.pdfIn PDF document text
    • http://srlamn.com/clients/0/00/00e84243199fd86ca7c15d66a0237eb0/File/63935689732.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=born+on+a+full+moon+meaningPDF link annotation
    • 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_off0000ed26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED26 17176 bytes
SHA-256: ea4f122422adc18261287f9434eedc538c52a2c879b692d7f590691316440e9a
font_01_sfnt_off000119a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A5 10444 bytes
SHA-256: fb21383d640883ccd3221ce09dd814bf4bc0ddbc89f3be99415ba39a7bdf7576
font_02_sfnt_off00013147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13147 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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