Malicious PDF — malware analysis report

Static analysis result for SHA-256 a494cf65ec1713bf…

MALICIOUS

PDF

81.0 KB Created: 2021-09-02 12:12:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 57e57880382b43c8dc5ef46c16cf8652 SHA-1: 1cdb06d6aa44cf42e9642ac4e290408a29b9a635 SHA-256: a494cf65ec1713bfb09dba8fa367bcf38b75c8eb0c1abeea92ee2b33b1238098
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised or disposable domains, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing sites or download further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://cateringkieuan.com/uploads/userfiles/file/27776566389.pdf In PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/2792bd06462a58aa5b9d391ea6e00ceb/bafukirilonedupoz.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f92bafd26---77965107752.pdfIn PDF document text
    • https://mihalex.by/files/files/luzatudewuzoji.pdfIn PDF document text
    • http://www.sealjet.mn/pictures/files/1943766210.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/zofawapakim.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/63147075286.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/20974824856.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/fadanobulujo.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/xofogojimeb.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f415377f---64450861739.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/b2edc780830261aea91f8ad689df3809/50723815983.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/zajitukobivubovu.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/93091321532.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/sibonilirotitusubuva.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210609022448_79e2go.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/takizunaja.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/bapuzupa.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/46140077935.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/xemerarok.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/56eq3e4hu704oacr7oobqle2v7/15622327821.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/a4dc7bfe45a0b883eb76d821bed7bbbd/34797609491.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=pierre+bourdieu+capital+cultural+escuela+y+espacio+social+pdfPDF 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_off0000d38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38B 18836 bytes
SHA-256: 93cb54e5dbe40a6a1727c0c21a0c2ffb3bf2ef43d3ea5f86114f1481dfbfaf14
font_01_sfnt_off0001049c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB3 10864 bytes
SHA-256: bf0b367d86683c22f20dd393f7fbcdb3bff479ac61e773803e8201565abcfb08

Open this report in the interactive analyzer, or submit your own file for analysis.