Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a5491a8a5084668…

MALICIOUS

PDF

90.3 KB Created: 2021-06-26 19:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 163425970db0959444fde8cf2908bb75 SHA-1: 89abef81bf65aec2580eb9fdcaffcaa940fd00a6 SHA-256: 3a5491a8a5084668087021c64d248d2083d5b3d2de72ca2905ec093516089b3d
156 Risk Score

Malware Insights

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

The file is a PDF that contains numerous links to external websites, many of which are hosted on disposable domains or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links further supports the malicious nature of the hosted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://garglob.ru/uplcv?utm_term=mid+shift+hours
    • http://cheapmarkt.com/userfiles/file/pegip.pdf
    • http://saigondome.com/uploads/userfiles/file/rowojibabipu.pdf
    • https://ises.ca/phpsites/vertical_living/uploads/file/ferilepalovijonawiwesiza.pdf
    • http://dellalontra.it/userfiles/files/kizow.pdf
    • http://drapikowski.pl/uploaded/fck_files/file/jadegogu.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076680c4ef23---67124605564.pdf
    • http://aarogyamedico.com/userfiles/file/tivuverepisi.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160730e3f12a21---tulevimomabimugetolima.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/1ff9e603bce718329db9892afd836069/padow.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d77206302---87172027575.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9e47e995c---59947485693.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072394236642---nisasujegogapusubuxebela.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/59eaaea55d43b0e6dec89b4415043786/47863139453.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/386b49a95fc1bc42ee20fb6a81fe6d4c/89831519020.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/523c509ccd3c9e6798c17612ea0ccb6a/96463212233.pdf
    • http://superfishinglewood.com/uploads/files/98283671803.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095bf45b1917---kalebesavomanizi.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095dfd518a9a---vuwixeluxujusagibebokidaf.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ac69b37f664---kedenijenenujebub.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6107334f4---tulimeraveponebo.pdf
    • http://drapikowski.pl/uploaded/fck_files/file/23762449833.pdf
    • http://franzoesischebulldoggen.eu/userfiles/file/zobowejazesemorazos.pdf
    • http://vorne-sitzen.eu/pcms/content/file/rapide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001002c.bin
5986b4bfce93c69c455e47942cdd56561ce37256abd45ac8a425ea7b67ba7a3d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1002C 17324 bytes
font_01_sfnt_off00012d58.bin
d1284b1c16a5a0a5fe5053865c525ee31823790e823d306a493b3f686ee6c06f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D58 10100 bytes
font_02_sfnt_off000143f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x143F8 16792 bytes