Malicious PDF — malware analysis report

Static analysis result for SHA-256 d36b5e622247778a…

MALICIOUS

PDF

98.4 KB Created: 2021-07-15 20:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 41f1c78f8bbc23c2ec9fcc88a6476fb9 SHA-1: a1fc78971aa5f35ad2326ceddb06a3e83e2c3c8b SHA-256: d36b5e622247778a66ceda2681c023971c80039242de8a36af49336a3a0599cb
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites. These sites host further PDF files, suggesting a chain of malicious redirection designed to obscure the ultimate payload or landing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b1d432afa---dokajuziwurow.pdf
    • http://breakevenpoint.pl/uploads/editor/file/rekelilov.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b7d467004---45399247022.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/d635f4fc4529c18356a4e8814edf89f3/43869488719.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/42d317e8e5408779651f5542d010d185/gesewuvizegopo.pdf
    • http://solamsys.com/userData/board/file/livujuvewukote.pdf
    • http://kaies.cn/upfiles/2106160231392469820meb3m.pdf
    • http://carefirstyoungatheartgala.com/clients/b/bc/bc61c41cf33a111e4089ebab1e34a2ce/File/74980531304.pdf
    • http://bestapp4u.com/admin/uploadedfiles/file/81656849722.pdf
    • http://minhphucvietnam.com/uploads/userfiles/file/mulatimatezodavaxiz.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/a2a688be2fdc17070b2bc99101ec8008/gedarugeg.pdf
    • http://clingac.com/d/files/relotatotesupuzukoduvaxok.pdf
    • https://birsamundapark.in/userfiles/files/nifad.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f4b3b01ad---92616383120.pdf
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/3614475bd222d232b0e16f656ec6012f/zemazamawaseje.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/e2d8b35799be9973cb7d7874ddf66c6b/pizikop.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/5gh1frjanrboostjr9cod0okdf/gapekepizeza.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/1e548f6e31ced47f179a423a1483fe06/62350444845.pdf
    • https://regionalhealthprogramsww.com/images/file/23251982383.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1609a9314e449d---92844950286.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=three+of+wands+and+three+of+swords
    • 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_off00011faa.bin
d334877a78e69ffbcfb90786409d36aa909f3e59eb249e1e9f49708e6e9b9685
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAA 17356 bytes
font_01_sfnt_off00014d24.bin
15e4fc06a4fc3e10a7eeb70f2f4e459457f0b95e00cb027a1f9fe730b6b21b7a
pdf-font-stream PDF embedded font (sfnt) at offset 0x14D24 10364 bytes
font_02_sfnt_off00016499.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16499 16792 bytes