Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2f9b8f8f0b18b1c…

MALICIOUS

PDF

77.5 KB Created: 2021-09-02 09:28:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 415c19405b2af1bd6b07cbdf9c7641c0 SHA-1: 760738b13b272d0c0d335e1dfcbe073ba98e8e95 SHA-256: f2f9b8f8f0b18b1c9318b5512d06cf317596832d53f8b27308a6d4832f5b6483
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a large number of external URIs pointing to compromised WordPress sites and disposable hosting suggests it functions as a link farm designed to redirect users to malicious or phishing content. The primary attack pattern involves leveraging these links for initial access, likely through spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=the+boat+dock PDF link annotation
    • http://garage-ys.info/js/upload/files/31849459631.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/c3nhk51id0t5l5tgj9vkanuck0/towujapadonawenav.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/bd7de8b89ee9564a95938171a212fc38/44280416103.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607443b829197---wezeduzoxivexokifobufegis.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093ce6f54184---50710705849.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/ligejekezafinenibunosa.pdfIn PDF document text
    • https://noddy.nu/images/file/xorizijijidofilo.pdfIn PDF document text
    • http://skalamatbaa.com/userfiles/file/zelexon.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/gorep.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/tijewapase.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/086915833984d23f981e7d73a321dccf/99111300599.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210810_28B21072B89ACE74.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a3783ceecdd---najomabeziguvujejezu.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/25513932406.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2ea2675cdc04c1d5bec2e5420bb0e3b1/84994352725.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/7f196b3f1b008255dd06be6a135dc5f9/dilikomewinum.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/ae35837cc944b45504e9291dbf7245e5/68977542065.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/91188183992.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609daf206bec5---wodovixelo.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/xulumepugiwu.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd310a30ca---zopukisuza.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd14c6b8b7---jupinisabezegonevuvobaper.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/81097507449.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_off0000cf84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF84 16088 bytes
SHA-256: e8fd9c28edcaf3ed8759385bc48727d558075e8fdb3b84124c8939759b79e2c0
font_01_sfnt_off0000f8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CF 10152 bytes
SHA-256: c577ddab05205563bc84903c04bef6b9542b87e064c487385330fce9bf4ffba2
font_02_sfnt_off00010fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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