Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e4ff91f420bb57a…

MALICIOUS

PDF

68.2 KB Created: 2021-06-11 12:37:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3c180adff1716ad1f48e78afb4fa9a4e SHA-1: 359ddc03894252b1e878d6ef1fd19ff02fa79366 SHA-256: 3e4ff91f420bb57a38e14aa3065e65131d61225689c8a0acc4514d24a8e40bde
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier indicate malicious intent, likely to trick users into downloading a secondary payload disguised as an answer key. No scripts were extracted, but the structure and URL patterns are highly indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7691

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://cructi.ru/uplcv?utm_term=english+file+upper+intermediate+workbook+answer+key PDF link annotation
    • http://webhenevents.com/clients/868374/File/42871033481.pdfIn PDF document text
    • http://texmet.pl/userimages/file/91734979816.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bbeb31b0c8b---75733237526.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/39931225352.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f71860534---tolevedexejewijuruvitogi.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/b0fb909438642cd1f2fe3d23e43c2a9c/xirubelamopofanuk.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0fceea09c---kiludewutapofe.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/dagolukebodatudera.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/64491220549.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae2b587595---bofuf.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160995ce42d85b---piveregobo.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2a94d68aa---34801814704.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/jademezogajidiba.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/54fccead17d64dac46ae6b6462d948a2/sazozibejurutubalebu.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a994f488e34---fudalasufaxawudutimotob.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/mosoxanefuditubovuxefe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC972 5692 bytes
SHA-256: 263347ff85beee668ffac24c6e4a7a58ff56ad965a3c8d1eb0b68ad74f9020cb
font_01_sfnt_off0000dcb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB2 15424 bytes
SHA-256: 196b7daf3038fb6451508b95e274a442162958990e8827b8dc5d9adb90bb7fef

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