Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6c11d31a1cbf5c0…

MALICIOUS

PDF

82.1 KB Created: 2021-08-26 23:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a0d84998c5da7ad7eadb226a0a2d2108 SHA-1: 8bd91d93cae7cf984df29b4864478d175ffc8202 SHA-256: f6c11d31a1cbf5c0a03b3ce7969c4969357d60024a1d8dbe0692c15c77e0a36b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. The presence of these links suggests an intent to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://medvor.ru/uplcv?utm_term=nfs+most+wanted+2005+steam PDF link annotation
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/611108d729b2bfa2e412e97eb9ec2a35/71101474215.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/jezipimi.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/8cf0fa3b74f3241f81e3bd53654be9d7/38635807791.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/kufum.pdfIn PDF document text
    • http://momsystem.ru/public/file/ruwoxugudidurebej.pdfIn PDF document text
    • https://beliangka.com/contents//files/28429546854.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/gefolavigepizawivu.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/650d8b3b002e2ac82e140e6cf81205e3/65342686631.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/qp9v73ero05nn67caggbcq1ia4/joseku.pdfIn PDF document text
    • http://baoveantam.info/upload/files/13860354432.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077883c5ab1b---29847678470.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/gejek.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/72jufvealhm74tf45k7qts6gv6/81893624241.pdfIn PDF document text
    • https://amblamy.ee/upload/file/xuxexilajemabosijefom.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/zarenigugexozu.pdfIn PDF document text
    • http://herbexindia.com/ckfinder/userfiles/files/69959670429.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a26f809df92---tutevu.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccfff3de076---21906206927.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/peviputigebesojexep.pdfIn PDF document text
    • http://skrn.cz/pic/file/97084271694.pdfIn PDF document text
    • http://gphs84.com/clients/866382/File/79924797187.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210623_110232.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cce687d88e---sonan.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/89453841210.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_off0000da83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF295 18460 bytes
SHA-256: 7cfdb43d5b749fb6f0ca86e1951568c7aee3e4e9fae9b55dd4952a26d6709e67
font_02_sfnt_off0001215c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215C 10716 bytes
SHA-256: 11333149650e4349bd23fa685971ffc66798be5a1962f559d6bc6a681f80d038

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