Malicious PDF — malware analysis report

Static analysis result for SHA-256 6edab1e3d8791e85…

MALICIOUS

PDF

83.5 KB Created: 2021-06-25 20:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6d9808f7983adc0fb87e3640282fbd3f SHA-1: 393a444b0ce006461f4f6b2000d2e785c617a004 SHA-256: 6edab1e3d8791e85ffd1cc586dbd59e1db9e6a67d47852787188cde79bb39ad1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/scfqn4vj9fahg7a6fpc5qp2jcq/kavibedibikuxofivelonigar.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e454ae374a---tebugezoden.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/cd68af70a69be921db9b3e418cb5bb4a/98713483727.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc98d3447e8---84053092518.pdf
    • https://deesudcoolingtower.com/userfiles/file/57757616960.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4dcc5a313---67373557346.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d5d7c2f90---59575076526.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/97769ab5110c011708c0754b92f6c631/bikewalolabinewarojewuve.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608188a18cf21---16900366963.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/9d886896f623e2ec1dbfc0725a9f71c1/demivizanogilofesolesi.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/156b2f0a4a5160402e30223d005360b5/sufopi.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b754ec0b46a---muximuzisonuwurekadirar.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cef3c36124---49467518589.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/8ce5e60526cbd19daf8fde4de89d4936/barixorerosiw.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb236de6e8---tutabuve.pdf
    • http://china-engine.net/ckfinder/userfiles/files/1512411830.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/817a94e924ce4c61d8f359ca9691afb0/lulaji.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160813decb14ca---kowoxijax.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad5e7d0ddf---95541146885.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/r5saf7s9om9jmklgfuj0e4ujg4/soratenivadisev.pdf
    • http://bhavalaya.org/ckfinder/userfiles/files/30739185496.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/c01abdf48789708e0446796b0d19cc5e/xiwijifezi.pdf
    • http://hud101.vn/webroot/img/posts/files/28548594832.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/nuwibijenixepase.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=a+physicist%27s+introduction+to+algebraic+structures
    • 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_off0000df9e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9E 16792 bytes
font_01_sfnt_off0000f7b5.bin
8e03b9e1b954e585c45891cf440ea3ba5071c58dbdcb5dfb7f8b559b955d7049		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B5 11160 bytes
font_02_sfnt_off0001116c.bin
d905af034f93a398672689a5a270026afe00967b2648a49843bb99c6f13a8d0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1116C 18388 bytes

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