Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7c1e255491edf0c…

MALICIOUS

PDF

79.0 KB Created: 2021-06-25 22:34:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c375d95c6b18bfba058b40973aa369c4 SHA-1: af0b45a8a426a09a4520660c8833881ceb401b0d SHA-256: b7c1e255491edf0cd21bf86beb1ecfa40b008eed4f948141886ac587c9911b0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, a common technique for distributing malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of numerous links to potentially compromised CMS upload directories suggests an attempt to host and distribute further malicious files, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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 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 http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c71323f053a---moneketudiro.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebcf9cbdae---94110735129.pdf
    • http://technoculture.cz/admin/upload/file/11861170764.pdf
    • https://brod-plovdiv.com/images/93899239497.pdf
    • https://sieuthimayphat.com/ckfinder/userfiles/files/butoxadoja.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d20d5c4de74---magisewetuj.pdf
    • https://publicbridge.pl/userfiles/file/reluf.pdf
    • http://firstcuwire.com/file_media/file_image/file/33042178730.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/bqjorqf8p90fugk59hu45lacs6/71763729159.pdf
    • https://etimes.mn/uploads/files/98525192813.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/sj3a7sclb9ilca0hqv74h7dgij/47818508049.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5022d87d9---82584034892.pdf
    • http://zkojicin.cz/userfiles/file/32797845384.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/614d8bce47f4f9a14bee70340746942c/29666386587.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3dba7d15d---numiwokapexunupugibod.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56f93e41e3---74128828566.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd39007bc3---zipero.pdf
    • http://jaika.in/images/documents/files/jilutoxuridefaridavoz.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16075e8e6d711c---bubewatelul.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6573e7ab7---zogunuxoxumonozalot.pdf
    • https://anandamsanyal.com/userfiles/file/12142390933.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/stlmoddktjbiclaop317mr1583/88217849270.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=is+300+manual+for+sale
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d334.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD334 16792 bytes
font_01_sfnt_off0000eb4b.bin
92ea63a29c67223ef5d4204992ca6ce6175802fa75ce937e6e5a038501fe3dc7
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4B 10528 bytes
font_02_sfnt_off0001034a.bin
3fd130149d15993b9ea8703c6fdffc80c04b98f6f44d15d5c02e52b73605c8d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1034A 16768 bytes