Malicious PDF — malware analysis report

Static analysis result for SHA-256 29530ad301d20f10…

MALICIOUS

PDF

80.7 KB Created: 2021-08-23 17:20:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d21c16b7456716799c60cf83aada3ef3 SHA-1: e7dbf52758fa46204fc6bf1bc1a25492364db2b9 SHA-256: 29530ad301d20f10348369f478efb71535ca0259d2aa7e64d4a7b276f65c42b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9543

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 https://coretry.ru/uplcv?utm_term=do+wood+pigeons+build+nests PDF link annotation
    • http://lezeckastenakosice.sk/upload/files/5932854382.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/14831476118.pdfIn PDF document text
    • http://gwhs79.com/clients/867100/File/79045800870.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/i45rrr5ic200precll4de61113/5806010815.pdfIn PDF document text
    • http://hilltopperalumni.com/clients/9/93/936f23dc4abb03f6d4a1aae2c8a32781/File/66022521180.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/38857218677.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/gavepinorixelup.pdfIn PDF document text
    • http://3sdent.com/upload/files/loperiwapolages.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/duvasojim.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/muruwiwuzavabepunowibo.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/6omfta8kv7t7cpnfv9mcf80gp6/xuxasudodivorapumudutafav.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/duwarukuserar.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/tofaragonisiboxipijure.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/94367489914.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/62248724148.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/pavodukowirudodufivutiv.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/zatesunowutamemixajenut.pdfIn PDF document text
    • http://waelfawzy.com/userfiles/file/66231488449.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/edff6332172928f1211556cf7a2cf9c0/lepurukuzapobigolujavedo.pdfIn PDF document text
    • https://equinox-e.com/upload/files/62159824444.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/1472be8c28c68de6c52fd7697022950d/73758501535.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f740ea2de5---17741467365.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609b22914dca1---26903193904.pdfIn PDF document text
    • 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_off0000e206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE206 16644 bytes
SHA-256: 70eac6461ab362e8bd24dbcdbdc24bd8f57fad949a9c4004739f2a590fd27808
font_01_sfnt_off00010d73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D73 10632 bytes
SHA-256: 82640d547786ce3a32c53dffa10b59444087f604fa06b642f25e9fcec77c8739
font_02_sfnt_off0001257f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1