Malicious PDF — malware analysis report

Static analysis result for SHA-256 48ad81bf4eceb149…

MALICIOUS

PDF

84.9 KB Created: 2021-08-16 06:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d8750f56cbde5355694f53e7e6eb7898 SHA-1: a87dbcd664a974a6fbad99dd933ffa222282be1f SHA-256: 48ad81bf4eceb149953930c6d64e7eebd4f6723062b42e1cf657c151ce6bb6cd
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links pointing to compromised websites, specifically targeting WordPress upload directories, and utilizes disposable hosting. The presence of these links suggests an attempt to redirect users to malicious content, likely for phishing or to download further malware. The ClamAV detection further solidifies its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160abf568bae61---51370216413.pdf In PDF document text
    • http://abwingssuffolk2.com/uploads/files/jobuzijovovew.pdfIn PDF document text
    • http://195exim.com/datas/files/meviwokinupumosizonasizul.pdfIn PDF document text
    • http://deauville.ru/files/file/75433287666.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/19497298727.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/aad89f5e80141488b5236302a8e28ef9/zisewitava.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/23967847827.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c349f01f01---midabazotewifiwokus.pdfIn PDF document text
    • http://sanmargholidays.com/ckfinder/userfiles/files/28589136779.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/47960012880.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/suwarijewugesituxiburuwa.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/99355063323.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/496f176be52c68689978a9ab663fd29d/8965542949.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608435792c305---rewor.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/ranunubasowasus.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-4-30/20210430091442777064.pdfIn PDF document text
    • http://foodchemsino.com/d/files/nuzagep.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/0se7iker1nsbnqf4at137mspf0/42002359867.pdfIn PDF document text
    • http://hiddenforrest.net/clients/76790/File/keromefebilipu.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608d23f384cc4---puwakozipel.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16071eeb2c0e20---81866793372.pdfIn PDF document text
    • https://susta.vn/userfiles/file/fujaxuxuxurom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=spongebob+coloring+book+gamePDF 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_off0000e89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89B 10760 bytes
SHA-256: 47ac0efdde7dc04c63208c433708d2a029b9b798995a57d0ac06945e0d9475ef
font_01_sfnt_off00010118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10118 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001192a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192A 17260 bytes
SHA-256: 5e8a6a8a2668b1c308f7ee67e23bb7c5771e3a42a546386d36a041c63fbf1d7b

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