Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac6f37dde795e35…

MALICIOUS

PDF

88.8 KB Created: 2021-07-26 11:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 0f2b778cd23109485abd30a1368551e2 SHA-1: 8bbe64eeabb07561a3174ccba66787f4133df82d SHA-256: aac6f37dde795e35ca91fc275c2aa8dfff42ca37b4ee2881894bb1e4c9936753
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal Web Session Cookie

The PDF contains numerous heuristics indicating it is a link farm and a lure for MFA or one-time code harvesting, consistent with credential phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the nature of the lures implies an attempt to trick users into entering credentials or approving MFA requests, likely leading to session token theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cs-web-design.de/ablage/userfiles/files/vogiw.pdf In PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/tusunonobozikite.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/23t9nnnb7qg5higlbkp5mfbnro/72275521125.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/9fe5333ccb9b77c048982eb1a42719d0/tifitolibiv.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/hj8rm9gdqntdiob4527rnf51a2/68441075667.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/k8ecq45s2m0d1e0gn1qa66kk5p/sazaramijexal.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/kozogagedalasujulefuvod.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6d304036f9---75541104202.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/a728fba8d9cc1653d9ad367a3dc05431/jesosusof.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2940eb5ae---6366437766.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/26436153070.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bipelubi.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609b80a137522---42841462847.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075330fdda02---90618628102.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e93c10d53---vavitetesojutimirogiwal.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/xukifanojeloralevavuwaz.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-6-5/20210605170210814074.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/f5b4a2e880c85e122aab0cd895054770/46450265707.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af5a2b067cc---9957105222.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/4s16ooerfd1c4fnj1j7p8qehag/wujilu.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/11651181012.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/61688056026.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/ac576acad5e20c76211b5b6b03a36f70/posivalevezesojopus.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da31281dec---siwedajumugino.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=add+yahoo+email+account+to+outlook+2016PDF 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_off0000f71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2D 16800 bytes
SHA-256: 9aa3030b95ca94a4379f84d307963a64fcb0b5dd79a740bbb5c489337ae72494
font_02_sfnt_off00013b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B17 11116 bytes
SHA-256: 5988b27104867977b142550502fbbb2d833b06d85d5b0484078165635da6fa68

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