Malicious PDF — malware analysis report

Static analysis result for SHA-256 fda36bda3c644089…

MALICIOUS

PDF

80.6 KB Created: 2021-07-22 07:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e28116714143e7d128df861a31398067 SHA-1: 03c02303d738805ee3d53ade6fef861b006f3975 SHA-256: fda36bda3c644089f9a8c6f278758370782449d626ea56d5fcc65c21270c2085
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to multiple compromised or disposable hosting sites, suggesting an attempt to distribute malicious content or phish users. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be part of a multi-stage attack where a password is provided to decrypt a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/70cb892f39f752d610a1b36db463f28e/45508137415.pdf In PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/pib34nmmoqt3okqmgqe99t8v87/tuxamimudeju.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/wofonoz.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/hjq676g6spl23o199i82b3395p/gununaralaxepefipajepuk.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/pl30butma1a4l8rdtbguavrvu4/36620290235.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e36fd8c2994---47800528420.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/21049558268.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/t5h4emoitci1ep7d76cjvgdagd/28685994821.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076436e7f66d---xazemobazukokedadip.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/90583231416.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/pidujajatogikasobineguvem.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/ef85ce48d56676364169d3bd0c54fdbe/xekotezidum.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/99905681018.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/dezinibixugodukij.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/wiguzivokagux.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/37431821257.pdfIn PDF document text
    • https://agatanorek.com/files/file/suxeziperer.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088fd3f1e04c---24026288629.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/f6f01e296497422576391a2d0a110629/waxafonive.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/lotesonidivadudapaz.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afea0d559ee---76115116635.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/2126606072.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b6481fa5d18---11755044995.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/608add97451564b2b809a90b815c19ab/98035305948.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14003925208.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=fluid+mechanics+fundamentals+and+applications+2nd+edition+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000d5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FD 16564 bytes
SHA-256: 43e24ceb5eea7171e70f109b1662ba0a3432652492cc665bef6632a3966f6842
font_01_sfnt_off000100f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11909 10980 bytes
SHA-256: bbac9978637715aaf224545f1774f17811f17aefee1c0433ade8ebc3d6437c6b