Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d92a0ee956050ba…

MALICIOUS

PDF

96.7 KB Created: 2021-07-04 06:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4da49d27d936d36040955521fd3237f9 SHA-1: cdb02612aea61d703218c216a673adba8b87aa30 SHA-256: 9d92a0ee956050ba4ab1d15409a0fed48de0bfef2930108b50b2f1ae3c715485
176 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the document acting as a link farm, directing users to potentially compromised WordPress sites and disposable hosting. The embedded URLs, while some are marked benign, are part of a larger pattern of redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://wallsfamilyreunion.com/clients/876683/File/fuvimutefefuliwemip.pdf In PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/4e95kls9qudp33uliunelhvsvm/desizesoxiduxavugugib.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9de7e9ab6---bafozuxinadixom.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/93148619125.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/82703924984.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/wixobutowutetiz.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/daa2d79d7c12d90e8eaf1d91e9f6e833/3545115487.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607c248c19438---megazozixolelavogozipewa.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/mijirijadevopugodigig.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/2522662431.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16086918fc33c5---kolajubizomifepereriduka.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/5a146d32b2941b8a0735948b61798884/84360905839.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2aecc47a0---wefazofejujadu.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d85997fed---38196471770.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ddcfff85c9d---11087808887.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/nodisidowezevaguru.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b9df303c4b1---zopurelategilifim.pdfIn PDF document text
    • http://abnicum.ru/files/file/totojug.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210608112835.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/79631514525.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1805e38f5---vubomikamoxadaza.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1608803cd23eb1---vagibelurofirir.pdfPDF link annotation
    • https://windsbs.biz/files/file/momapure.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/2goggfsl6d22hj6ss0lvhltmb4/35797097777.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608558f2a3339---gowijezubolifikum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=what+is+the+meaning+of+the+prefix+rePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11081 20088 bytes
SHA-256: 8f3ab218980366c4af87db82bc6a48663a64069a825691a2f71c20fec14e625c
font_01_sfnt_off000144b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CCF 10852 bytes
SHA-256: 88b6f15ee4f4c0e99fad4cb3319baf4a45e3d4edfb3840a0d867f256025c1ed1

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