Malicious PDF — malware analysis report

Static analysis result for SHA-256 161b0afc156c723c…

MALICIOUS

PDF

85.6 KB Created: 2021-09-17 05:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2d67f8d48193669975533a1fa59c1bab SHA-1: 80a0198496d5db17957476776822a7fd4252ebac SHA-256: 161b0afc156c723cd440109bf3ab36b1fcaf3cc09b6baea4e1d05f03550ba149
172 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous links to compromised websites, suggesting it's designed to exploit vulnerabilities or trick users into downloading further malware. The presence of a 'download button' heuristic further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=central+intelligence+movie+torrent PDF link annotation
    • https://masukpt2.com/contents/files/30007746188.pdfIn PDF document text
    • https://havilahbuilders.com/userfiles/file/pujidoruxonabawojali.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/lebuzipo.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/31130564079.pdfIn PDF document text
    • http://gibisch.biz/files/files/20882071155.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0346b8d40---zuxamoresapunesi.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/26096318975.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/dewazugezeripejolazu.pdfIn PDF document text
    • https://unitjaya.com/contents/files/53369053222.pdfIn PDF document text
    • http://sciattella.net/images/file/55623057090.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/dapojotuz.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/83387834947.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/384501f491e7d48012ec26dee463cc95/lixone.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/sifetokafoxaxukewaforub.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/52355379681.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/nanevebudarujo.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/8d01a38ec4f5c3e9cf2aa359b8c80841/nuxemaxamezuxukujisozafo.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/jegepekinetuvuweruxes.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/87099247368.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/tisesunasu.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/b292tk5b28o506o3j3ch2j9e34/jejubib.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/81540216724.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/77862561144.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/87271113938.pdfIn PDF document text
    • http://fourfoods.com/images/files/gekanomage.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_off0000de19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE19 10500 bytes
SHA-256: e4315d0caa9cd9c409a61cc13cee173d220acf42ce5e73e4e91a6df100741053
font_01_sfnt_off0000f607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF607 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E19 22300 bytes
SHA-256: 03b5b7f8ee9e930df784d425e3422e39aee1a5b9ec137ea4533a1a1cc10fef6d

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