Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f2103be3ff3e114…

MALICIOUS

PDF

89.7 KB Created: 2021-07-24 12:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 474cd5326d860d4b0d8707c17ef8f880 SHA-1: b579fc3fcb23c8155cbd50de1048182dfaa01037 SHA-256: 8f2103be3ff3e114b2bb74f5b8f9a356974b491210409bb1db06af6a27525f78
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites or disposable hosting, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://x-software.cz/data/file/27908784477.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/4d766de5554506ce3daadeffc260224c/gukiserazutajazeginowu.pdf
    • http://biemmecommerciale.eu/userfiles/files/fafulip.pdf
    • https://immo-cjeanpaul.lu/userfiles/files/17439070710.pdf
    • http://elmbbq.com/uploads/files/fejurukuzemejejiga.pdf
    • http://abwrosedale.com/uploads/files/71700257949.pdf
    • http://suapaiatuipelehakefamily.com/clients/80707/File/sufometotezavep.pdf
    • https://studiorampinelli.com/file/69594753000.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/3da6f21b1a71a95bacc5c11bf979f862/9331907153.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085153c90e22---sizijovamus.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/d0n86m8p210uv28cktj3d2953j/buliba.pdf
    • https://asset-books.com/userfiles/file/jojewolisob.pdf
    • https://nanyangtextile.com/userfiles/file/21519329079.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/c3fb9l53q026qoo1v6um656rpa/66565453810.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160876182c45bc---bofopuwaxarefewi.pdf
    • http://e68momo.com/shopadmin/upload/files/12783293017.pdf
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/h01lrojq5hjt5k1nvpni00ccqn/wobowekudetiriwatowikib.pdf
    • https://maintogelonline.info/contents//files/63289489097.pdf
    • https://www.tunnel.de/files/uploaded/file/depivutapas.pdf
    • http://chukysovin.com/img-svc/files/69392237127.pdf
    • https://parokisantolukas.org/Uploads/userfiles/files/mazumaxefudit.pdf
    • http://www.kickcommerce.com/userfiles/file/gexiw.pdf
    • http://fredericjean.net/oplusco/file/wovivazozelewewaze.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/2ce7ae061ea1babb2a80038703e42e0a/latomuk.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=rudolph+the+red+nosed+reindeer+sheet+music+for+piano+free+easy
    • 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_off0000ecd9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xECD9 16792 bytes
font_01_sfnt_off000104e6.bin
6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13
pdf-font-stream PDF embedded font (sfnt) at offset 0x104E6 1692 bytes
font_02_sfnt_off00010cef.bin
ded01928bed89fc33739879651d2bf04eedf46cbe0c38401ba86b78f0f1dc932
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEF 11144 bytes
font_03_sfnt_off000126ce.bin
ffa17439c5c7cb34019ecbcdd2ebd201be31040fd8cb104a37aa55902dce340f
pdf-font-stream PDF embedded font (sfnt) at offset 0x126CE 17752 bytes