Malicious PDF — malware analysis report

Static analysis result for SHA-256 487d7b7e71e17b96…

MALICIOUS

PDF

77.3 KB Created: 2021-09-24 13:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3351e908b1247399abf28e247e873979 SHA-1: 2c9829ee4fdb2ab1fcf1393e6c0e0c7a73ed8b9c SHA-256: 487d7b7e71e17b963387f5011c4c6e3db641e8b1c86e4f52c37ea802ec6f14f0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm with numerous URLs pointing to disposable hosting and compromised WordPress sites, likely intended to redirect users to phishing pages or download further malware. The document body is unreadable, but the presence of many external URIs and the link farm structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://coretry.ru/uplcv?utm_term=greenhills+postal+code
    • https://securitydm.eu/slicice/file/54077561163.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140d75b6c364---64769826489.pdf
    • http://geomanteia.com/userfiles/files/fenuwogifunilaloxi.pdf
    • http://altelaw.com/uploads/image/file/mejizufozixuxegep.pdf
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/zikisabisakitodixedip.pdf
    • https://cairparavel.ro/app/webroot/files/userfiles/files/23264131787.pdf
    • https://kudamatsu.org/userfiles/file/46330517819.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/hlsqig2cuut10jvkf7b92gb288/66356470415.pdf
    • http://zhatuogz.com/uploadfile/file/biwozedisep.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/853736259301ade0682c79af7b67be5d/59494064501.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f4b821629---zijobozafuvadexixim.pdf
    • http://sanfrancescovet.com/userfiles/files/53441549116.pdf
    • http://www.serenissimaservizi.com/files/wakefolonakuj.pdf
    • http://iberia-ex.com/images/blog/file/bifozimawagajopifaro.pdf
    • http://internet-trade.cz/UserFiles/file/33852132970.pdf
    • http://saraya-shop.ru/upload/files/52371788389.pdf
    • http://enjoybowlramenandpoke.com/uploads/files/45914203779.pdf
    • http://shahnawazonline.com/uploads/files/79597247142.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/d220540f63d271f7d2a2e88251643b93/kakisuzosusogoketuxopedej.pdf
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/7928124798.pdf
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/vemixusodosev.pdf
    • http://sgrdpandher.com/userfiles/file/juvuloluzunezapikabaje.pdf
    • http://ordinate-ltd.com/file_media/file_image/file/55692044841.pdf
    • 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_off0000b2c1.bin
36c871118fc4cd89be4e6241ad604d933a65597ac37ccd5a23db5d4a943b15a8
pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C1 18028 bytes
font_01_sfnt_off0000e149.bin
9de450f8c9e8b33a3ad3ed8c94710ea39b87139a6f6c2a873a6f90e9431ae8e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE149 10652 bytes
font_02_sfnt_off0000f999.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF999 16792 bytes
font_03_sfnt_off000111aa.bin
01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
pdf-font-stream PDF embedded font (sfnt) at offset 0x111AA 16232 bytes