Malicious PDF — malware analysis report

Static analysis result for SHA-256 367e250e8ec360d1…

MALICIOUS

PDF

73.9 KB Created: 2021-09-24 19:03:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b6f82234f5d646bfb9ad66da384a90b5 SHA-1: 3d5182788367069f315b775254dfe2e9f2b9554f SHA-256: 367e250e8ec360d1b1d9def115b7678ef08b5293cab41cc79b254207c63d5f3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. These links likely serve as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://sofar-france.com/userfiles/file/xiridavow.pdf In PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/sapazufiwegarazenagotor.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec99dac6fd---xusike.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/bonipagabasofixeded.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/3140877266.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/0kmqcldemir9689endre76klf1/11428762340.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/wugogudesab.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/4737299514.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///75123351326.pdfIn PDF document text
    • https://kalendarz.probik.pl/fckeditor/userfiles/file/foned.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/wupikewufomijivebidigufej.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/93819405898.pdfIn PDF document text
    • https://agregadoschucuri.sinecsas.com/ckfinder/userfiles/files/48196196660.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/tiwojuguz.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/tewajuzuxafakareke.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/86274003800.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/91047846278.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/nozuvenidede.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/sigixibuvivusilixewu.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/mokivewolole.pdfIn PDF document text
    • http://signfabapp.com/ckfinder/userfiles/files/kabutuzudupinowifizujinu.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/9ec415cafeb94e2fd4360a66fd738450/37072426874.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/bbb5886313305faa15ca5f84102f27d2/20094488756.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/pazitogimekajaxetiser.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8ef76f190---pukudaxovorirojafujokakex.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210902_5CE9023752079868.pdfIn PDF document text
    • https://thehouseproduction.net/file/98457130993.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=outlook+365+smtp+server+addressPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB84E 11112 bytes
SHA-256: 78124061a8a4220ccdaba0a37bf0d0aede3ffd7adee123fd659816a2c7f6d4cd
font_01_sfnt_off0000d26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA80 18196 bytes
SHA-256: 9ef252ea752a1bed443aca00847ff2c81be7072c2e0db208e09ef6dc759fedff