Malicious PDF — malware analysis report

Static analysis result for SHA-256 cac460f3f51ce147…

MALICIOUS

PDF

74.6 KB Created: 2021-08-18 03:36:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 599c1e6e97ecd6c62e5daec659a92738 SHA-1: 4cc0fce06536d9be978dad709dedd832431c01cd SHA-256: cac460f3f51ce147645013e27e1d516d91fc2480847ac3374b8c32df9174ac2e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The embedded URLs suggest a phishing or malware distribution scheme, aiming to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://archism.ru/uplcv?utm_term=oxido+de+nitr%C3%B3geno+iii+nomenclatura+tradicional PDF link annotation
    • http://shannonlakeestates.org/fck_images/file/mupojitazoninibeximup.pdfIn PDF document text
    • http://hnht-electromagnet.com/d/files/kejutanul.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085417b9b0b6---46410203874.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/xebavi.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/tesumifubebitutolulodef.pdfIn PDF document text
    • http://jaika.in/images/documents/files/xilubumupatasarajemoki.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d15dd76b52---duwowiguxanimikipofogus.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/50s6a75glv928jd9r4cek5b3oc/70999302014.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/38251257254.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/20758bdd76ecce6489c2894ca3e326af/wewajok.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0e228da4a---44453405014.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/6ma2dmsjbesreg29bb4gi1i942/pigejix.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/0g2kpgna4lp1dun0lhg0kvsun7/meteretu.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/da9cec2306cfbf3fe216da5dfb32af19/minidowasurifepuroxemiza.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210527162212470883.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/tufekowatup.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/lobimuro.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/78105116550.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/4096226130.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/3315e7f958778863c5deabb995d1d4ad/gimotivisawemeb.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/6ec03fcd5a5fb735a88c3149d9ee7543/fomadix.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607871326b350---74741142093.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd2a0a9234---40276998702.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/lejufekifupiluzofe.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/48901348843.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/93826980912.pdfIn PDF document text
    • 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_off0000c129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC129 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93B 15648 bytes
SHA-256: e63b386ec336035f9c1e4fa653ff23e53906b2406f52b24fe104be46ca774e15
font_02_sfnt_off000100c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C7 10912 bytes
SHA-256: 6799df6346a60847386c5f92c960352fce261d80a85aed9be87526bd42fe2df8

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