Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1ac10fba5240af9…

MALICIOUS

PDF

187.5 KB Created: 2021-07-14 10:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 89209dcbd3e6136a4a06b588096ece45 SHA-1: 4594749b2b63f62adaf725299160585b2caf7184 SHA-256: b1ac10fba5240af9691148ac3a81ea32683424dd08608068679c7ee3b40e4bc3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to external sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8527

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://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/820e33b6e831ae3ed4723e507dd83b4f/mofikodabojemetar.pdf In PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e93ab13f792---13536282513.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/60553423720.pdfIn PDF document text
    • http://wenxuezj.com/images/File/2500170679.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb16a8df74---89075626599.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/kagovuxagovunixiremukel.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/vogikugaviruno.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946a87a9620---rebiwixeperafali.pdfIn PDF document text
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/81299218736.pdfIn PDF document text
    • http://gabortech.com/admin/file/tixemonemixabegiduzire.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609092bcdc378---78485031637.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160830e407f76f---77038670478.pdfIn PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/pasekesuzitokebo.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc29833872---92959332404.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e98e05280---67734228001.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/fajarilomimopulumo.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/83rvb4r17dt9t37r78i1g53dua/waribazopalupevakimisopi.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/zemowesenuno.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/fagejozuzewusunugasotexi.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072c526d2d2f---seludalotudewonoxiwol.pdfIn PDF document text
    • https://windsbs.biz/files/file/zibapaxojenez.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/573a69f43b4bf829f4cc93373995d37c/rinorode.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/29674299624.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/417dc3fad24146898ac0f78bf8fcb850/39815466269.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/mukuxefiparesexagowalo.pdfIn PDF document text
    • https://lymfologi.se/anvandarbilder/221/files/baxidakorimolosisudem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=asta+demon+form+first+appearancePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001fc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FC95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000214ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x214AC 10716 bytes
SHA-256: 1d0ca0801dd99307148872af9d36e6b3cc70548b774e8de2feb8ce2aa022a870
font_02_sfnt_off00022d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22D43 38268 bytes
SHA-256: 9d7cbfdfb28e0020109dd8a7c8fc1776530b6d69a728370371702e2750578cba
font_03_sfnt_off00029826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29826 16340 bytes
SHA-256: 88a5f3ad9079b2340172ecd64f1cd79ba1ad1753eb2b73e58de10c5a7be67d15
font_04_sfnt_off0002ae19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AE19 19004 bytes
SHA-256: 599118b358850511f1e766629f2699d82e0104dd16cd5ca4a930d6431ef8eb5e

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