Malicious PDF — malware analysis report

Static analysis result for SHA-256 e25b82d5c2728f60…

MALICIOUS

PDF

85.8 KB Created: 2021-07-07 15:38:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1587108c1da040cb1b69702f56648fc4 SHA-1: c58e5e126efc6a82c192c1cbd4cc73c10f7d8359 SHA-256: e25b82d5c2728f60f777cec2d1c8eb4dc0b45621667bd5f0fcc9cb1442c2714f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely to facilitate phishing or malware distribution. The presence of multiple external URIs and the overall structure suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/fd4b1c49390e1699658d57bda5d9786d/85356648835.pdf
    • https://eobliecky.sk/userfiles/file/32950571938.pdf
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/ba00bc452634c07e6cbddff76671d28a/zogadidokamanu.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b76e9371603---sinikudosuvul.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609aefb455a99---13050401276.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160848699b4122---47357074055.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609162a9043e4---nitopiginub.pdf
    • http://www.hgbehringer.de/img/files/files/forurifinikulafosipi.pdf
    • http://chinajnbt.com/images/upload/File/40996617202.pdf
    • http://cck-brno.cz/ckfinder/userfiles/files/30064477678.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f728e7b9b0---xorogoxegizoro.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f568a76f0---65406571401.pdf
    • http://ttlh.vn/storage/ckfinder/files/3441641756.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c691da94fe1---680231430.pdf
    • https://derechosenred.org/aym_image/files/kutigo.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160af23ced0ddb---wegatulirupokowukisopa.pdf
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/2b6bd3b3b3289fd8e399f5b2a20f1dfb/nezefux.pdf
    • http://mdsalon.ru/img/lib/file/fasof.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be5191217b9---nuvanun.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9b5cc388a---sazitetaximemovezizorav.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdbb1264f8---didijepelibewadasiniv.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/396a79b4dbfb1121bf3d932e184c6a5a/35119719174.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/36971215aa81b7806fea742faa8885e7/fifepawotige.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/68707tqkfj3o34hjsc71vf7o2g/xiwob.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=what+does+a+purple+and+blue+aura+mean
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb67.bin
6a772f247a3456381726aab2a9c3c9bd1a491b033eb022196e5dff613ac9bf3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB67 17560 bytes
font_01_sfnt_off00011929.bin
3d99614cc6976d6d61ed0a009dc3dd96ae3b03a03bf19762b49b61db7782456a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11929 10796 bytes
font_02_sfnt_off0001319f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1319F 16792 bytes

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