Malicious PDF — malware analysis report

Static analysis result for SHA-256 b40c64439b71e7ef…

MALICIOUS

PDF

79.9 KB Created: 2021-09-19 12:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 125af583c67141f0ef6e34086aafc2ee SHA-1: d4168d03995959cd3ba91e1b223f1e1f96a4ac32 SHA-256: b40c64439b71e7efcdb49a55a53e6d9260bd795e5c14856b34b1505bf8c63cd3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other potentially untrusted hosting. The primary purpose appears to be directing users to external resources, likely for phishing or malware distribution, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/2ad5caae7a161a60a8f8a1ef26db8de8/jolozutajagukuvixig.pdf In PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7b733f220---18718658458.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/93669945342.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/9621069955.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/86825795571.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161343a961e4a6---95795791638.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/98977180753.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/bemet.pdfIn PDF document text
    • https://sjaindonesia.com/sitefiles/file/63977492632.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210906030257_638255948.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68751916564.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/lefidexi.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/38411218397.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/67563258299.pdfIn PDF document text
    • https://basisnomor.com/contents/files/befowapikaduwemuzexosit.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/futadaza.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/fepud.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4e618ce5b---91544905774.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/55745685792.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/26910635578.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/kitiworobezomup.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/6415666000.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/xutigajofigunevedagav.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/mefonuw.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec09436378---62382415152.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/muvuvufumatoraw.pdfIn PDF document text
    • https://mkontroll.hu/File/60467246521.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/86069240380.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=a+quiet+place+full+movie+2018PDF 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_off0000d311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD311 11064 bytes
SHA-256: 699d608c8f58062e21f2eaa49b0a1ab4c8aa2f8a445c9dc44d5d76978f1811c3
font_01_sfnt_off0000ecfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFC 17360 bytes
SHA-256: aa16dc8abb9d48ee056c8981c7861f88edacf85516290ecafcf28fa12c59d089
font_02_sfnt_off000119d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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