Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3b8e6397169150a…

MALICIOUS

PDF

92.6 KB Created: 2021-06-26 20:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5124f9129774950e4337126388b2ae9b SHA-1: 771df7042b81e0948a2df41d2717a4476595f188 SHA-256: d3b8e6397169150a2835e3a0a2406d554d8cb3b0facfd2296984aee4e06910ac
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ClamAV and an ML classifier, and exhibits high-risk PDF heuristics related to external URL links. Multiple heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of numerous unknown URLs further supports this, indicating a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f40b1dcb6c---lufigikimuk.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce8fd4c7b8d---napejezeratus.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/2f04f3be924297d68c310a3b0dff4f14/62033522892.pdf
    • http://eiak.org/upload/editor/files/38206863296.pdf
    • https://ctsgroups.asia/images/file/vubadutov.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074d5de4dc81---tejuxibenijowovute.pdf
    • http://sushi-belovo.ru/files/kibadomitemizupavevudima.pdf
    • https://larioenergy.net/uploads/file/runajixulepik.pdf
    • http://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8802cc54da---26014523135.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f632e98b9f---lerefikudipavavefi.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/6sp8pdegkt5j5paursfve0hs31/55777777418.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16076c4c47fa00---10515151619.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb2f1e021b---xatewixi.pdf
    • http://ruoumoc.com/upload/files/fikusevifubokatow.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/4a23b715ddbcf42a7feb1d105c401edb/xulir.pdf
    • https://childrencareandliteracysociety.org/userfiles/files/zezomonodofa.pdf
    • https://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/51f142e0b6d275e3b301901aabaa42a9/gemitavu.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609643af03ed0---nogisadupigunedutewopi.pdf
    • http://iaestedresden.de/userfiles/file/fejonupelaw.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/7da899b03c31e7ccaf47cc20f64da491/7244108800.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1d705fecb---13795132592.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c0117d18caf---xunubevi.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16088717f31a12---vefitib.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=rainbow+comes+after+the+rain
    • 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_off00010941.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10941 16792 bytes
font_01_sfnt_off00012153.bin
648c2c5f976f8216dab8f3fa415b1e877a3e092fb3dc240b40559631b898a84c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12153 17008 bytes
font_02_sfnt_off00014cf7.bin
1c5bed0b8432a96d1b2b79daf747266907302e5c045b24832dd457d04491a2eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14CF7 10824 bytes

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