Malicious PDF — malware analysis report

Static analysis result for SHA-256 c29da241e7df6232…

MALICIOUS

PDF

81.7 KB Created: 2021-08-17 18:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cbbffa34c1b1f73bed92b177ceb560f4 SHA-1: d224e7a2bbc85dac126045bceb6572e79e20bd0f SHA-256: c29da241e7df6232494c82d39fe79b81a4823d250b8b3b9ab327388d2c101123
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting domains. The embedded URLs are likely used to redirect users to malicious sites for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://pistant.ru/uplcv?utm_term=outdoor+gourmet+triton+pellet+grill+manual PDF link annotation
    • https://comfort8889.com/upload/files/86572530005.pdfIn PDF document text
    • https://spiuruguay.com/ckfinder/userfiles/files/8675351772.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b829cdaca42---54664555792.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/94077860567.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fb20825c9---47826180932.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/bisanefazipesasumil.pdfIn PDF document text
    • http://adainst.com/uploade/files/20210705125316.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/92938658697.pdfIn PDF document text
    • http://recrute.fr/files/files/deloxozulazim.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/85295420517.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/gusomuzubematasuvevusitab.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/57866667642.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/2e15e6b7a6661b49cefd1a8255766a73/76061289492.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/45780072964.pdfIn PDF document text
    • http://ruihuitax.com/files/file/genolosiwuxazapefamunup.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/vokovazebem.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/63865366795.pdfIn PDF document text
    • http://laduses.nl/image/file/jizikovomogix.pdfIn PDF document text
    • http://bbu.vn/Images_upload/files/57802172581.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/47f76b32e30c3ed12509556178327161/fodifokukumobutig.pdfIn PDF document text
    • http://stevis.cz/files/file/wojefonamebadodegujeka.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210816101851.pdfIn PDF document text
    • http://nenorm.com/files/files/tozokuxamizavu.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_off0000d6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BF 10692 bytes
SHA-256: 5bfd646667b822690b57720e4ef969ceaf868fb1a1e4857f21e130ac33b9bcd8
font_01_sfnt_off0000eefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001070e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070E 18848 bytes
SHA-256: a4cb6aedabb8b232215d1f6b4fbe37c199593390082823aba6dd10f2d80503a0