Malicious PDF — malware analysis report

Static analysis result for SHA-256 751d0265cb64c6b9…

MALICIOUS

PDF

74.3 KB Created: 2021-09-06 22:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b20ed6cf0fe544d42ada7f0a5ebf6af1 SHA-1: 4a574573213ca59ed72a91cf4436abd196e9cf8b SHA-256: 751d0265cb64c6b9947b811f50ff30ff95a0e552757735f8c39684a89c3bcc3c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/e0da915b29ab6d5b02c7e6615a3bf37c/rijutonajavodeboso.pdf
    • http://ewhamd.net/upFiles/ckeditor/files/99642776842.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/ppugl66kheh91nggcogsnd625p/97765147696.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/3r6rahhoi9mkb3jvr76tv2dk26/16979745349.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081160ae8440---jozekux.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16116dc0801f34---34470889755.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/7093f3e2468f16716b9a06c9e9290aca/valokuj.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/kii9jr5sd2mid9jesh1itbejj7/23995736911.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/0b3c928db8de1388b4d2cc4236e07f93/50139511048.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827791e762b---69084413875.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dad6b61ff2---gipowivajiwawavi.pdf
    • https://cissud.eu/uploads/ck_editor/files/16524286155.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160d6be5568bf3---34175203101.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/u15evn672ndv0vamnctsvqr8qg/55394474645.pdf
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/tomabejadibofemogizuruj.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d3934f83a---xujuvikakuvidadulim.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8c0c7dfd6---44218483118.pdf
    • http://bularz-auto.pl/images/userfiles/file/kusijozubotetu.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/nlc8q3pubse2uq6hphfmk0t1g5/19171740982.pdf
    • http://www.naraihillgolf.com/admin/userfiles/file/51427738338.pdf
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/5314931652.pdf
    • http://amidoux-peintures.com/ckfinder/userfiles/files/benebaxezasej.pdf
    • http://mstreatmentadvances.com/userfiles/files/vifer.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/44d4df29c754d941d424f3d153664752/xojirebonaxif.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=identifying+vectors+and+scalars+worksheet
    • 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_off0000c03f.bin
a10f9d709f07fdecbe801ecbf9650724e76b665d2d3f8319d5f7ea646e44c1e9
pdf-font-stream PDF embedded font (sfnt) at offset 0xC03F 16060 bytes
font_01_sfnt_off0000e998.bin
45faa38fcbaa2d8d3fed9506731f1e3ea6cfd4a6bd8f16d407edc884b2d64005
pdf-font-stream PDF embedded font (sfnt) at offset 0xE998 11064 bytes
font_02_sfnt_off00010330.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10330 16792 bytes