Malicious PDF — malware analysis report

Static analysis result for SHA-256 2567f3640f850631…

MALICIOUS

PDF

90.3 KB Created: 2021-06-25 13:23:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 45ab8a78e3e10fa62c75bb28f74426b3 SHA-1: d2915081c0746b7f9ff2de8f71d676f2a2f8c7a2 SHA-256: 2567f3640f8506310b4a712683ac51e241ea53ec819e296c83865668a2a68afb
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, containing numerous links to potentially compromised WordPress sites. These links likely serve to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4da6a7725---84695667821.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/mu0bpibu9s3tggnignit836oku/74611203538.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adfcaf80430---83887323770.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/e1947ae784e8c40fc7b6d419bf783e88/resawe.pdf
    • http://tcsm62.org/uploads/news/file/80555238395.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8h79gaknvc8a1acer5j9oei5s2/didorarupajezawa.pdf
    • https://meganimal.pt/site/upload/file/bufowaxe.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c61e0fd087a---87401887836.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/7687ff3572ae7a291cca6164b6fbae64/gerajefibi.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbec00db4e---27228110722.pdf
    • http://dunajecbiala.pl/upload/File/53655247893.pdf
    • https://nguoixunghekiev.vn/userfiles/file/4101885187.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/7d0ee6a26de8d1747d49b6cd01d186e3/62446905497.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/b75ce64b6e15b5749e6813f49acd284f/70202097555.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cef093aaa---xevojifababivixafivusetox.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a94dc938f2.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=newton%27s+second+law+lab+report+conclusion
    • 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_off0000fd79.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD79 16792 bytes
font_01_sfnt_off00011590.bin
f8802304c0adf25a7906ff0a04824bc97379bffab31f6ec53306584d54b2c287		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11590 10844 bytes
font_02_sfnt_off00012e9a.bin
54fad3fb1c2865eeaab119e783e56b571c02de66f7266ad30132980b65ec7be6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9A 17340 bytes

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