Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff174ccfda48159e…

MALICIOUS

PDF

79.7 KB Created: 2021-06-29 23:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fe21c1a05db6d8154e174938d246c761 SHA-1: 6f1652b0513d7670737d3e04ee37f0b769684f88 SHA-256: ff174ccfda48159e0dfcf58e0610bc2482cfb640f7b1b75b33327d70d70d2876
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the nature of the links and the detection names point towards a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cadd6bcb9e---82741760455.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16076f58030682---gajeleletipejirabofaz.pdf
    • http://www.cerel.eu/images/wyswig_images/file/92648577222.pdf
    • http://midel.me/userfiles/file/webesiwenanisi.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ef27b21d1---50536698998.pdf
    • http://paoladebenedetti.eu/userfiles/files/dubog.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e70b56f840---96690959545.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/40346636752.pdf
    • http://learnersdigest.org/userfiles/file/figixorituraror.pdf
    • http://stylowa-pss.pl/userfiles/file/40860489874.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/r2ai4apoh3fn4li98skqs09hf6/temiperusejosijijazo.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb881a2ac1---57356753068.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607202a5ebc89---xirutazusilezoro.pdf
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/05255a701bdeed22ea6d2e5c4a723092/31330014553.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada19b77604---78588441032.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160734554ce8cf---pemikaxebidofo.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/7065510ef1aa5aedab92a0d6ece64101/zavikomejakuvatefes.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90fb5de97---27989541522.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbd7d09f1e---99139001753.pdf
    • http://infinity-pro.ru/userfiles/file/momesezakisovuk.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c3713861b---74966998858.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/967aec1debcc1efdd4db4e023f40a3cf/44830165799.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b0817727d342f5dfb97551019d717a86/nurisat.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=html+ul+without+bullets
    • 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_off0000d374.bin
c62773ef711ba7f31ff1db6a27dc7b11f0d7940e5cb00c8b37f5664bd17fc356		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD374 10324 bytes
font_01_sfnt_off0000eabd.bin
66392fd63763facb62f60ee01cc042b4e659a4393fa6df41e830944e0a7e457f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEABD 17708 bytes
font_02_sfnt_off00011983.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11983 16792 bytes

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