Malicious PDF — malware analysis report

Static analysis result for SHA-256 b73c86f8786eddc6…

MALICIOUS

PDF

85.6 KB Created: 2021-09-07 15:18:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 443167c8e8d17f6cf8ff475003dc3bac SHA-1: 931d00134394661dab369be0c318b376219fb1a6 SHA-256: b73c86f8786eddc64415355ae0da587becc54b6a618eadabb8b2b06ce2d95e49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external URIs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of external URIs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://philabc.ru/uplcv?utm_term=zabranjeno+parkiranje+znak+pdf PDF link annotation
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8344f27e7---19513247625.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b89b7684980---30386393870.pdfIn PDF document text
    • https://unicornccc.com/ckfinder/userfiles/files/buwokiraxebefogezuzun.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/6132540411.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/84963390670.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/94033199314.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160738f99d85a3---kefafedomosibos.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/zigonizixorejurago.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/3302517a1d4167a4bfd362494c5cba25/gapipume.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/lipewega.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/451621c395a417c2bf094cf3c84d54bb/24365292820.pdfIn PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/zitigosu.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/62715798626.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/58697052497.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/webolelujejipixiw.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/71634459037.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/509bf5ef8469960df3fe5d607b6f2578/watoxil.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/xodefesewifufidifover.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a41b26879a9---96275008124.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/913a39ebb5339cd078b2c52fff690665/77798178823.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/zojumogof.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/mekegodovuguxevuwopek.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/nomodovizezuroxuxul.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091c7718a084---27428313868.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/84885301584.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000d1d6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD1D6 18972 bytes
SHA-256: cf34600e4f355f8e9fb808177f7dfd80ef54c5adc54ea0ea732f1c76f2db40b4
font_01_sfnt_off0000f0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E2 15792 bytes
SHA-256: 985d2d9420ada66c5c5652618060a31169a67b9bcf8d0c17a2e78dab44c488b4
font_02_sfnt_off0001184d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13064 10564 bytes
SHA-256: 2801302d0edb7fd381fe2625bcc7aed0a5b3dd413c79399abaae33267e036902

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