Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef465dc7a3c0957a…

MALICIOUS

PDF

86.7 KB Created: 2021-09-11 04:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 48680312e2b40f472a6c904d831424e0 SHA-1: c624e49fd0b446906aa86b464d8ccf8667d1197b SHA-256: ef465dc7a3c0957a74677526d060421e5c9d462bc26b925429d741238c856b02
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external resources, many of which are hosted on compromised websites or disposable domains, suggesting a link farm for phishing or malware distribution. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely provides instructions to decrypt an archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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
  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://thibiditrading.com/public/userupload/files/40706897602.pdf
    • http://myphamso1.net/uploads/files/petupetub.pdf
    • http://cctsw.net/whly/up_files/FCK/file/20210907_094545_123.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/2l2mc8ckva4k57li9e6962i026/kipemanopawamig.pdf
    • http://archetipoingegneria.it/userfiles/files/16333962051.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/31543355375.pdf
    • https://srilangkapools.com/contents/files/45200796994.pdf
    • http://neoneophytou.com/ckfinder/userfiles/files/lovokuwefifefe.pdf
    • https://rovetco.com/userfiles/file/83976585845.pdf
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/pigulivew.pdf
    • http://saimiri.name/upload/file/vunomamizapakipifof.pdf
    • https://www.nvsrolko.org/ckfinder/userfiles/files/99316213919.pdf
    • http://cityfate.com/files/files/zorememidefotibubibi.pdf
    • http://ifaistos.reality.gr/~triantaf/images/file/niwul.pdf
    • http://diakmelo.hu/ckfinder/userfiles/files/5872698154.pdf
    • http://tonyprins.nl/images/uploads/file/74466524784.pdf
    • https://bahispesinde.com/gnc/veri/_files/86068594358.pdf
    • https://agrimal.pl/userfiles/file/piluzim.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/498a86a78eeaecd8283b689361ef681b/55106180902.pdf
    • http://slhospital.com/upload/fckeditor/file/zigutufanula.pdf
    • https://pointswestliving.com/ckfinder/userfiles/files/nidiwovoneje.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c24184841a536b338a07ad906d561c43/70019579268.pdf
    • http://dpholding.ru/uploads/files/wogokixowidagobetipuko.pdf
    • http://bogaarchitetti.it/userfiles/files/dupedaxikijobezuke.pdf
    • https://ismart99.net/upload/files/fowivodigalu.pdf
    • https://gedayapi.com/userfiles/file/bomebijoborunorabumisol.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=convert+eml+to+pdf+online
    • 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_off0000ea77.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA77 16792 bytes
font_01_sfnt_off0001028e.bin
aa976369fd2d8fa6cd08b4c5859638e4fe8882d7f6ea18e29b84425324a8d151		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1028E 10424 bytes
font_02_sfnt_off00011a21.bin
bf607b5271a34830b31091bb54c924f0e7900380bb6d1dbf8dda3498d659d9a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A21 19560 bytes

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