Malicious PDF — malware analysis report

Static analysis result for SHA-256 3160931fd06a72de…

MALICIOUS

PDF

90.4 KB Created: 2021-07-13 19:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f3c6bc7cb9da38109a85970f3009d784 SHA-1: 6a430b8b10dc5a64422cc87d8e547a0836545ad6 SHA-256: 3160931fd06a72de94c46cfd14d53766595751d922074988d30694940d765721
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to compromised websites, likely to facilitate phishing attacks or distribute further malware. The presence of multiple external URIs and link farms on disposable hosting supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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=moderately+differentiated+adenocarcinoma+treatment PDF link annotation
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/26e073cf67cb9dfd4e33e981181805ab/81700955709.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/76387013719.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/44246690268.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/0887f4540cf4e4957bc67cd5c982666b/50343142362.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/6mag4vqvrg4so4ldprjcl3tar2/bifimalu.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/xifebexijulavop.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d6ae1a98f---rusuroluzasemexakipes.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5099de227---96752009644.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/lekesugajixiladafitesini.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/nuvugawesujekapaxodenutug.pdfIn PDF document text
    • https://citrasas.com/ckfinder/userfiles/files/vurobonad.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825567f069d---90697186222.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c8ebe21dd---kilonuwufojada.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/kixutejesajalebara.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/48374d99j9mffbk8u1f08rspe3/72976290963.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/430635e21f14b8138111df67191968b0/25567840808.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/be064d1918877f8a12b34d8f535a7700/silaferobeditusawufamil.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202106/1623312706.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160813a0d006d0---xokakimajaluxer.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/tumabutoxuxivawug.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/53102021018.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c000c935ce5---gefufoz.pdfIn PDF document text
    • http://inglewoodreunion.com/clients/68690/File/lubofovuruxin.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD9 16912 bytes
SHA-256: 067cf97967dddfdc9f24787a6c666fc46ca48e802cfc2f4233edc9b64316a93b
font_01_sfnt_off00012bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC4 10576 bytes
SHA-256: f87cb8980dd45ebd88777d489e99a963ed52c65fb07f0880126310530d93dbf4
font_02_sfnt_off000143e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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