Malicious PDF — malware analysis report

Static analysis result for SHA-256 8683ddce13a0f9ef…

MALICIOUS

PDF

235.9 KB Created: 2021-07-07 15:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 74ce4bea1d611575c401122767929adb SHA-1: 796910846144bbfe64ee035b5c80cddc4549d8e3 SHA-256: 8683ddce13a0f9ef6e795ca01319b053dd97a0fa3983599ca4a340d13b34109a
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that are part of a link farm pointing to compromised CMS upload storage, indicating a phishing lure for free downloads. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing campaign designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://richiefamilyreunion.com/clients/7/7d/7d03816b951c94fc7c065ced7c7ccdcd/File/filatibobusedam.pdf In PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b6ba925d6---giwuxataw.pdfIn PDF document text
    • http://kbchina.de/upload/tivadodadozexadiwotiwojav.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a994dc37d63---sebuzekaniworilutetumat.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160acb0762bdff---60983658311.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents//files/34987198503.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/rikibesigobefuwejosobot.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/15920491465.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/13311479564.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609cecdb2372a---pexokovor.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075e7c216338---60263429223.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c93dc7d65---gesari.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080933883df7---boponapukizoxur.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/evi6rpo9b9n5u8ac6mlg76iud4/19056483125.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/60677233824.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/6435d891c1d5274a23350e1d5638a794/74947806880.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/nors8i4ur9p6q85aar7fpmffhq/52097705969.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a0088d30b15---bononajames.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/f809ee2a67eb0cb9a2a7ee3697a1451f/jerobuvazigu.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/0q8hs9a8gjs363ns1va6887sgh/bekepelizuribagazonekuwam.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210620_BD4263C89DB8B2FF.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9d7c25a06---30390330309.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=upside+down+star+in+circlePDF 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_off00033ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33EF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00035702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35702 18924 bytes
SHA-256: b1e3178a63752591bf9ab18dd93051197fb7a28a376b90c03417c2377d0b2a9a
font_02_sfnt_off00038955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x38955 10600 bytes
SHA-256: d46bdaf7a2564cf93f580aa99c979e5bb62554fe8c44fa94c364f2ab279871fb