Malicious PDF — malware analysis report

Static analysis result for SHA-256 be4ecdea1bf494fa…

MALICIOUS

PDF

84.9 KB Created: 2021-06-28 20:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bd920564cb0bd82a0b0901b799c18e58 SHA-1: 9fbe674872f7c6d53face1e36ac1b10a8fb9f32a SHA-256: be4ecdea1bf494fac001fd9bf34f8f320d60389cec623455d63a294110c6e6f4
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other disposable hosting sites. This pattern suggests the document is designed to lead users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://zetrade.cz/userfiles/file/84396675155.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/l58f88rkkrs9102uh3dcu4pmca/10099152067.pdf
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/jaguvizusijabova.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079ceb94191a---47343844481.pdf
    • http://seoulsquare.com/userfiles/file/bexumemidoz.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c29b8401d---92309780755.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/30573e89bf340f8d044dbae3f5a6ab98/sidirir.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076cd274ce50---xusefalukevelepufuzad.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/15d34dac20ef786bdcf40b0d14664daf/65267102515.pdf
    • http://chiengthai.com/file_media/file_image/file/napig.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/47828927b2ef8f9d18d7bec70a1b7f95/fadozuzewod.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160926a8f321e3---33988071416.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc1d1bc1e9---zoginavi.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/65c48ee475190578c3b3d714082d75f8/66992779183.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cade68610c5---ribudo.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1607bacd881853---mupogof.pdf
    • http://metabolit-plus.ru/files/file/penum.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b834a309fba---51841747900.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160738c23f0a96---78614970695.pdf
    • https://zoldlepes.hu/userfiles/file/gixegavopifu.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079dbe73f4e9---masakumodetidumukadidufu.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/033981007357cdc4fdb71d8bf9805b0e/xunatukoliviruxuvajapol.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=applied+physical+anthropology
    • 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_off0000e845.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE845 16792 bytes
font_01_sfnt_off0001005c.bin
2692586396b6ac8bfc7cf85c576ba7a73cb2644339dc6d18810828753334d7da
pdf-font-stream PDF embedded font (sfnt) at offset 0x1005C 10888 bytes
font_02_sfnt_off00011956.bin
1f98cbfe3d808001593c060bfbdcd24da127c136af8362cc355a5322634090b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11956 17128 bytes