Malicious PDF — malware analysis report

Static analysis result for SHA-256 c56758f73f0f4753…

MALICIOUS

PDF

88.0 KB Created: 2021-06-25 20:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 19d0424b427fd83bf644004af6de6384 SHA-1: b5fe6ea02b0d766ebafa0cbc15ca623e8bf4eed1 SHA-256: c56758f73f0f47539568a370d0d9f9cdbf1ce194ac97c2c1eb9353572b0d65e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised CMS upload storage and disposable hosting, indicative of a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6051f12d5---zuvabetukejigogumudotum.pdf
    • https://rijst.nu/userfiles/file/40774662913.pdf
    • https://zoldlepes.hu/userfiles/file/jaxakisuzejizefez.pdf
    • http://uralinteh.com/uploads/files/makitulijixob.pdf
    • http://cl-pub.com/files/files/59448492945.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/m956rr7qtufcteictooabvtrbe/rimiwowenepivemo.pdf
    • https://bestcoloringpages.com/userfiles/file/21032637768.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a844481a8---xobed.pdf
    • https://baohohoanglong.com/userfiles/file/51578320221.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/a172840d7208bede50f771dd14db367d/buridilunosov.pdf
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/pefukugigozipok.pdf
    • http://househouse.it/userfiles/files/jadujenekakenutarotidi.pdf
    • https://thefencedocumentary.com/adminfiles/file/49773162049.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/9vn1j31nh8q5k9hccfvg63cjc2/46168489928.pdf
    • http://msamerica.net/clients/873634/File/babasil.pdf
    • https://etimes.mn/uploads/files/27051038000.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bac6b6ea419---87745696602.pdf
    • http://oresteruggiero.com/userfiles/files/bedokijuxusugixafoxepa.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ddd60bbde---14821488175.pdf
    • https://audreyheselmans.com/_files/file/87160614045.pdf
    • http://gayaarchi.com/userfiles/file/20210610160104.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c61de44cacb---wadudunepukukijopok.pdf
    • https://brod-plovdiv.com/images/29512370377.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=lay+investiture+meaning
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e08a.bin
6e165cf6d581e85bccf78d08da8dd86d7dc772dc805d556cbb17f012ac5a502a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE08A 16896 bytes
font_01_sfnt_off00010c26.bin
bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C26 16252 bytes
font_02_sfnt_off00012207.bin
084f5c12019086b867d6f5b9401bfbd88a92ad1cd82c0ba491c490b4b4bc9689
pdf-font-stream PDF embedded font (sfnt) at offset 0x12207 10520 bytes
font_03_sfnt_off00013a05.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A05 16792 bytes