Malicious PDF — malware analysis report

Static analysis result for SHA-256 65919579137b2221…

MALICIOUS

PDF

80.4 KB Created: 2021-09-05 10:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2d5466003c88b9f36d2b39a71feb07d6 SHA-1: 816f66d53671b02290345d9cdbea3ba911f7f796 SHA-256: 65919579137b2221368d3e5dfec93e758d2d33b8c3a322e03a429827f9f444f9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains, indicating an attempt to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7606

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • 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://ventexevent.se/uploads/file/vodasukuz.pdf In PDF document text
    • https://honghow.com/ckfinder/userfiles/files/48604865744.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/rutilixogebo.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/feforuxukowonunojal.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/nazoveruxoj.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608104526957e---waxepewofibosirigir.pdfIn PDF document text
    • http://sooclose.eu/upload/File/71091887470.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf56207b68c---26536986686.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/39155510112.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/de913f88661b687c7e278630e311735d/65174916953.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/97794332157.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/92368531743.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/17370213458.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/71142936805.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c918b99de---325675549.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/muzunawiw.pdfIn PDF document text
    • https://deepex.hu/hirek/files/37935963752.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/vromf21040eq5rfvk79maf72ti/5764099930.pdfIn PDF document text
    • http://skrn.cz/pic/file/wusufogizaborajekunega.pdfIn PDF document text
    • https://123natura.com/stockages/files/katasariremumiraki.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021052913024934.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/27205832325.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/romomukuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=sacar+rfc+con+homoclave+pdfPDF 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_off0000e256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE256 18452 bytes
SHA-256: 9c1936dac91d0c77aeaa60b669c232a8ff722d04e380fe4a92cb68a9146ad89a
font_01_sfnt_off0001120d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120D 10668 bytes
SHA-256: d4b5c1e3b47f69b2c68e04e3cd5c79c7d1f3ab56e3d57660189bde194512898a
font_02_sfnt_off00012a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1