Malicious PDF — malware analysis report

Static analysis result for SHA-256 872c10ec8ea44df3…

MALICIOUS

PDF

96.7 KB Created: 2021-07-25 20:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7d31583ce55934ced64fdc2e62f0ac9f SHA-1: 194d28195d2ab5d77b8bb150c912529471e6d054 SHA-256: 872c10ec8ea44df3b11715697d133cb108601de32d6724db9ed2172504c23f9c
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised websites or are hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to directing users to malicious content or further compromise. No scripts were extracted, and the document body was unreadable, limiting the analysis of specific user-facing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://palaciodelosnavas.com/userfiles/file/87663342063.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/msfllsouomlbmsp4kmu2g9r10d/xizegigiruxevumuje.pdf
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/wotusojexasexovupegu.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/edddc131eeed83e02dcc0a0b57ac7862/92360056467.pdf
    • http://ligneus.hu/upload/file/51138727593.pdf
    • http://himalayakebab.com/shipinc/userfiles/files/73695850674.pdf
    • http://ranjitabiswas.com/userfiles/files/vewowulabefep.pdf
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/20066476733.pdf
    • https://liniagdanskzydowo.pl/files/nalutimoxamajuwuj.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/e45ac1ab4b80b819b8a480dffed475b5/gozorizikaki.pdf
    • http://diysmart.net/userfiles/file/lisape.pdf
    • http://abwlanham.com/uploads/files/jodoporo.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16095d1f5d64eb---gojepedebasas.pdf
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/34191787763.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/3h02cs19fvqeomlcea8h24gavm/36565844576.pdf
    • http://dyglas.com/userData/board/file/mumet.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc4f41694f---24541865033.pdf
    • https://dcimx.com/files/16101287344.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b96eb4914f7---namizunezafupes.pdf
    • http://nirmalapublicschoolerumely.com/userfiles/file/80305748236.pdf
    • https://nbtele.com/en/cache/fck_files/file/68210041018.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16094b5f6378f5---kunafogejewepoko.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/200d78ddebdeff819b6d0786a69dce08/30655847704.pdf
    • http://antifftech.com/uploadfile/file///2021050123131412.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/up45g6jgdr13s6rn3rjrqgpn68/majemaravevurefaxojot.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+much+does+jcpenney+pay+an+hour+2020
    • 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_off00011513.bin
371275db6cc6764f9091905ddc077fc538f901d1a233831ef496cc6153d1a011
pdf-font-stream PDF embedded font (sfnt) at offset 0x11513 11208 bytes
font_01_sfnt_off00012f38.bin
b5f9c230ed7706eabb35e480ce9b74b233faf0edf7a232448a2844a10235d6dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F38 17200 bytes
font_02_sfnt_off00015c0e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15C0E 16792 bytes