Malicious PDF — malware analysis report

Static analysis result for SHA-256 86a9f74d335448bd…

MALICIOUS

PDF

90.1 KB Created: 2021-07-13 22:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 28a18ce3c7e5c60d8a0b4faddaed8b11 SHA-1: 5ccc074442845c85f87282370c4b75cb9fad081c SHA-256: 86a9f74d335448bde9b0e419e327f55885da3003d52b444ca7f14c12120fb367
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be directing users to potentially malicious or SEO-abused content through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9ba8dae86---56016744651.pdf In PDF document text
    • http://www.moyekolodin.com/files/14423194104.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/1f69458a3d4cc840965b904568fa7c91/70048796482.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0729eab2b7---9115135299.pdfIn PDF document text
    • https://bonacorsi.it/file/kosonajekojigobafesu.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/c7l2lrgh2itriqvh1dtnovstnm/porefovojufegadir.pdfIn PDF document text
    • https://coevent.ru/upload/files/veruxusif.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/88483615975.pdfIn PDF document text
    • http://surtek.biz/image/files/20150116_075554.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c55301e7f6---36848308824.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/mtpejiasjmufh82rihtj78lr95/wobedesuzerurevon.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/64901452452.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16097189caae5c---muzasowumoturegugis.pdfIn PDF document text
    • http://salkim.com/userfiles/file/wuvobonivigevinap.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/88927701541.pdfIn PDF document text
    • http://sun-eko.eu/files/file/puxakonajubokojagixi.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/j42615lt6nct7fki6qc83k8rqn/funaveluvej.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/6dvjf3vi823dsf0sg95e28kc95/bemozogepidenevazojaz.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e1b823cc0---bivagul.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/fegifokeg.pdfIn PDF document text
    • http://mckeoughfamilyreunion2021.com/clients/b/ba/baf9e6b347377fae0abe5a87436fc4cf/File/jogusozesunutona.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/nanoperutopomoz.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/ea37204dfba14a502c7e0bca5c2cfc4d/bebin.pdfIn PDF document text
    • http://sgpeo.pl/users//file/temova.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b239db0a971---navik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=auditions+for+tahidi+high+2020PDF 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_off0000fe04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE04 17008 bytes
SHA-256: c1b038203ed9dbd9f06a4a9003dc7b1eca85dcb348a4047de93d78b68e6670c0
font_01_sfnt_off00012a88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001429f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1429F 10776 bytes
SHA-256: 0e46c81e925d078a984fd0007b75ba43528420dd5d1b3f43252f1b0bda2d5033

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