Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac6ceac33594f812…

MALICIOUS

PDF

90.2 KB Created: 2021-07-08 05:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 076430d445d16887bbbfde472dcc3883 SHA-1: 9f4c28c795a03145fcb93fdf3138edf91cc5685c SHA-256: ac6ceac33594f8125809c162e1dd5557316102173997e9792ddb2ae44d20ab80
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous URLs pointing to compromised CMS upload storage. The PDF document contains embedded URLs that likely lead to phishing or malware distribution sites. No scripts were extracted, but the structure suggests it's designed to redirect users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier clean score 0.2304

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085727cbe590---10774603337.pdf In PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/30389a7322cecdb4ec85e73f8a6e9f65/66817382853.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/jvgsubahg5l0qkjp4q89fdqsje/51167814031.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/180fdf273bb56215c786833caf633354/55638441254.pdfIn PDF document text
    • https://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/5fbt9fm2t1o5scftbr2n6bftus/36821602617.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb5359cf15---29236055978.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/7bd7cd3557b81caf019ac6f8da30993c/13593718784.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/7urtli7ogliunjsrgi12reu440/54445655589.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4daa4fb4357e10d07a944b6fc17a94bd/vopoladimiwowalajupuzo.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/69a9217942809cf94e1dade17d74390a/99481170139.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/lixigugojajegiwomituzur.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/zekid.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/2d53cb3fcdb09ec9a245caa175570a05/rodatol.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/zamigefanamikodu.pdfIn PDF document text
    • http://medi-sen.com/files/files/34557681948.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/27883492498.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7372b2109---86571067938.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/29586473780.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/leweremeworipe.pdfIn PDF document text
    • http://altinay-law.com/images/file/2641300219.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/46daa97e04b569a1df9b3b6cbfd45dd3/6893961432.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/89175889175.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/40519237867.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=common+interview+questions+and+answers+for+teachersPDF link annotation
    • 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_off0001072c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F43 11124 bytes
SHA-256: 75849c2307263017949f1435c63cbd0697857f9c41b22241ab14252151444682
font_02_sfnt_off000138ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138EC 17696 bytes
SHA-256: 2a1e7c72b1b635848525d5398d8b0602980a5006be2a18f2e2c6ba9779642ba8

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