Malicious PDF — malware analysis report

Static analysis result for SHA-256 078bf7fd03cfd986…

MALICIOUS

PDF

82.0 KB Created: 2021-09-03 16:28:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 23374eb519a5440f9efca312deae0fed SHA-1: 5bcff4a8b23a9128301c68910509076ebad1f1dc SHA-256: 078bf7fd03cfd9860cbe681fa0ebba767c035c916b7ce577fab1eef30fdb2fb6
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to websites hosted on compromised CMS platforms or disposable domains. This behavior is characteristic of a link farm designed to distribute phishing content or malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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://hodinovysoused.cz/upload/file/76193354158.pdf In PDF document text
    • http://1night2daytour.com/ckupload/files/38493217105.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/20701332419.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/45733621606.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/linelo.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/9170db30848808ca9e98f01fe539f3de/sexirojanike.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/2d16fd53adbe8cf81b79a038708547b8/topugibozujixepidunozagaj.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/99311716855.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a46b18f1675---vojifejunegukagob.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/77395605658.pdfIn PDF document text
    • http://iworking.vn/uploads/files/49142176128.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/hnj21phgvgo9rqhb5stlfuluku/senituvuf.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/86d901740b88730f9cb8f11cd978c71f/17981785515.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/s60gbanjd2bih77sf9qkc5id56/22152547552.pdfIn PDF document text
    • http://sierrahighalumni.com/clients/878712/File/xiroriloratin.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d32325ca55---wefumazumisetojaroramego.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/80363709834.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/c70f457ac3e9d2faca8dfd604587d990/96602916929.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/rufugi.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/salapadivirunav.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/saxigozajelaxiros.pdfIn PDF document text
    • https://siroyensao.com/upload/files/18836274505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=types+of+social+mobility+in+sociology+pdfPDF 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_off0000df28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF28 11080 bytes
SHA-256: 75160b0f37505e83f064042ce3dad01390c713f412d452a40081e559c8e8657b
font_01_sfnt_off0000f894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF894 16440 bytes
SHA-256: 75c48a19dd02a20b0d1daf614938394d267646fc36fef588965bdb621738444a
font_02_sfnt_off000122f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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