Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b8a7ae8ab93ed01…

MALICIOUS

PDF

41.2 KB Created: 2021-07-07 17:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 1b366566855da18e4b6cd26e1827ffdf SHA-1: 3d650a1c74aee142828cedb0723dfd803c4035c6 SHA-256: 8b8a7ae8ab93ed0170ad399199f9b97ce2ff4cc2784e91868ca59624975828d4
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7341

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 41 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/17d927632b6f9ef5d2e14d1a875e1a15/50108185845.pdf In PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/v0j92766nvgnv91cmg3b1t1u1a/99301310269.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9b230c4bf---5037280973.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/46196916705.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/wugavamom.pdfIn PDF document text
    • https://luminex.pl/upload/file/9687346980.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607944ce961b9---47125169712.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dddaa43ff---79482078422.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/55326379139.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/41008743994.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/fogevapaxilog.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/am24bp325mtigf3mdvgmaeqfu9/wefalomugituz.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/pevewofamagakosa.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/terosubotalux.pdfIn PDF document text
    • https://all-new-wow.com/upload/files/43282895761.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/gc7jgome2hsv8fhupfv9frhdjm/lajaxada.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/26905858297.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/36673346784.pdfIn PDF document text
    • https://rosycaffe.com/file/70462235887.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/50041471921.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/9a6el36s8bqsu1f4v7eumdplef/53793223259.pdfIn PDF document text
    • http://tragadsonisurat.com/ckfinder/userfiles/files/kumuvuwowogisex.pdfIn PDF document text
    • http://jonme.net/ckupload/files/65175425508.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/xukedogot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=the+leader+who+had+no+title+pdf+free+downloadPDF link annotation

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