Malicious PDF — malware analysis report

Static analysis result for SHA-256 938450b4b023715a…

MALICIOUS

PDF

84.6 KB Created: 2021-06-26 02:07:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6100b042d987414b136b76baab639037 SHA-1: 02b47a3ea7f67f4d64f78ca52b8ae3bd43c4a669 SHA-256: 938450b4b023715a8fdaa7d2350850c3faa9c9531b762f0b9dc9bac68d639551
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload directories, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites. No scripts were extracted, but the structure and URL findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609285f1f3ce4---30649519316.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/c04afc0bb7d2264af647f9147ed69447/21508240583.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2c102a282---wowajokoxadupimavi.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/e55el4ppp7cdh01o1s3h4pkoc2/76899939711.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/a7ae92e8fd58b4a50dba9872ea9c93af/6692956708.pdf
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/afb33ff048bb58e22532217a78bca906/68363530824.pdf
    • http://antifftech.com/uploadfile/file///2021051117012132.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852f47cbc34---taxodiferi.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6b33ea91b---rimuz.pdf
    • https://prtl.pl/userfiles/file/fofameruvomedogus.pdf
    • http://alkanboya.com/files/file///fefevatozozagedasusepikin.pdf
    • http://teormech.ru/teormech/usrimg/file/10126297801.pdf
    • http://nissanotogovap.net/uploads/images/files/95763757874.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1055da6e7---putem.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/b6a2c826b311e3c0f632161db3cca9d3/taxirovimagadodad.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/63f5a520a2a9b7e3adee18c4c94885b1/39352819811.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/207d880a5b11eaa0b1ef8030ff4a4d6d/20776663733.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdacb2bfd4---paneju.pdf
    • http://kaies.cn/upfiles/file/44809412936.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5fd334e6b---2630105034.pdf
    • http://chromatographvials.com/d/files/87076929364.pdf
    • http://changrung.com/ckfinder/userfiles/files/49050820933.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fccc9c7a0---21284803032.pdf
    • http://mp-hd.de/data/aktualnosci_imgs/file/28963759811.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=specific+components+of+physical+fitness
    • 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_off0000e83a.bin
f291da2194843f145b6ee7ae370ea7fff9a329c8f934890951a4d428db20dcf9
pdf-font-stream PDF embedded font (sfnt) at offset 0xE83A 10832 bytes
font_01_sfnt_off0001010a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1010A 16792 bytes
font_02_sfnt_off0001191c.bin
93f7cfc39cab3c72c44761d5f65a2d1c2d2d3a513bd437f9adca73335b968e28
pdf-font-stream PDF embedded font (sfnt) at offset 0x1191C 16912 bytes