Malicious PDF — malware analysis report

Static analysis result for SHA-256 afb87f9d1da4f8d1…

MALICIOUS

PDF

72.8 KB Created: 2021-09-19 22:15:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dcb5ce1c03e391d6a6d1b6fbeeb915ed SHA-1: 34238c808790c8cf4446f81228d941c055076789 SHA-256: afb87f9d1da4f8d182af471db838c416485269c0320d40417a0a2f5b15baa92b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detecting it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting, likely to lure users into clicking malicious links. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://bocghebinhduong.com/media/ftp/file/gusinusewozokamo.pdf
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210917075450.pdf
    • http://engcaphone.com/_UploadFile/Images/file/tixori.pdf
    • http://solartgaleria.hu/images/file/74032310657.pdf
    • http://marcth.pl/media/fck/file/vufezugawususukogura.pdf
    • https://glycocalyx.nl/userfiles/image/file/66316141922.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9da8918c9---20558623552.pdf
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/napepasosajotoluwibuzalul.pdf
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/ffaf3b712e9f2fdd59906514d0405c0d/64643702202.pdf
    • http://anhuifan.com/upload_fck/file/2021-9-5/20210905025431994696.pdf
    • http://gartenstadt-apotheke.com/userfiles/file/potipuwomavisi.pdf
    • https://vinadesigndanang.vn/uploads/image/files/tuxijuliwute.pdf
    • http://righetti-ticozzi.it/userfiles/files/92689385488.pdf
    • https://client-sms.com/ckfinder/userfiles/files/wopitak.pdf
    • http://nuocmambason.com/upload/fckimagesfile/19f6e1cb95b8c45f74ccd5e33b47d04c.pdf
    • http://mfcpavpos.ru/file/84793067222.pdf
    • https://psg66.ru/admin/ckfinder/userfiles/files/23623537747.pdf
    • http://makesrealsense.com/ckfinder/userfiles/files/fagixerevulibuvewoxoneso.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161469df307a80---88848928243.pdf
    • http://www.uc-kushiro.net/images/library/File/20238321471.pdf
    • http://domadoma.cz/userfiles/file/rozag.pdf
    • http://mobilahomedesign.com/userfiles/files/80151045889.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16142333f069c8---16358470992.pdf
    • http://imosa.asia/uploads/files/202109141144388255.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb6aeef4c1---pizidumawejopad.pdf
    • https://aildf.in/userfiles/file/xolukuvakosiroxaxitexagox.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=my+hero+academia+season+5+episode+10+english+dub
    • 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_off0000b762.bin
ee515c2bbf4a0962d0fa3ff93cbfd9f4bcc1c330eb30e2763f2a17b6a135fe3b
pdf-font-stream PDF embedded font (sfnt) at offset 0xB762 16592 bytes
font_01_sfnt_off0000e252.bin
02c217ba779dcf99bca7d939850056836c812babf6e5cd935a8069a2c87ced45
pdf-font-stream PDF embedded font (sfnt) at offset 0xE252 11516 bytes
font_02_sfnt_off0000fd0f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0F 16792 bytes