Malicious PDF — malware analysis report

Static analysis result for SHA-256 35fd7a66a9264f84…

MALICIOUS

PDF

80.7 KB Created: 2021-08-13 22:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: eb68dc585f2062ea6e623091b4cbde44 SHA-1: bc44f164d4cb12b97501b550b71eb7f964fa4899 SHA-256: 35fd7a66a9264f84e6fdf0f71f990a4b8a4f68f64bc8f25c24f3068694413afa
154 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable domains, suggesting a link farm designed to distribute phishing content or malware. The presence of multiple distinct hosts and the use of UTM parameters indicate an effort to obscure the true destination and potentially track user engagement with the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6637

Heuristics 5

  • 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
  • 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://queure.ru/uplcv?utm_term=antibioticos+betalactamicos+pdf+2019 PDF link annotation
    • http://mfcwestenkwartier.nl/beta/userfiles/file/82262424848.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d3e6056ba---xasipabazot.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/suxelavovas.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/43759029543.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/11449973465.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/54593199554.pdfIn PDF document text
    • http://iwort.de/userfiles/file/vesanovimo.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/69899052158.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a816f3634---37934486865.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/stuscsp1a4n04hvofdfrhlcagb/70062495468.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/76435747076.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/ramusurenupukesegomiz.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/e07f2daa4e9924ff3b709ae41e5af533/geratoruk.pdfIn PDF document text
    • https://exporoaster.com/app/webroot/files/images/pages/files/zenogu.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/goxunufobalanafivizurip.pdfIn PDF document text
    • http://trimblehighalumni.com/clients/84492/File/futivugolotewasawejuzelif.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160df5acca4337---86880584511.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/61665354282.pdfIn PDF document text
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/16344343367.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/73121413180.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/xokoxunuzebowuxebezajaku.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/wurawomapujanopogoj.pdfIn PDF document text
    • https://mangmalungtea.com/userfiles/file/fibiliraxazozinevavijiwom.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/93438843786.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED16 11264 bytes
SHA-256: 5b1c7b7aa19d66e865cd14c1e2a44c3fbccad220f026bd0227862d842c756599
font_01_sfnt_off0001075e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075E 17656 bytes
SHA-256: 19cb05bc9c915ec76f508cc4792cba130c80032d2df6b4bf3edc6ab08898025f

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