Malicious PDF — malware analysis report

Static analysis result for SHA-256 98d3c0f1a4b60814…

MALICIOUS

PDF

86.1 KB Created: 2021-08-03 11:45:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 51edc38f2318b2a365c9ee1e2609472b SHA-1: 17a720daa292077a04837c195631d8dbc0fd8831 SHA-256: 98d3c0f1a4b60814026869a268bc96cd438f955e8c2acb771db0f34ef52b1708
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the final destination through multiple redirects and compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://drivescuolaguida.it/userfiles/files/mowigexibawuno.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/fodewaduvetolukabebiloki.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc05495fce---84253131137.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/8c381937f5fb8471fc1b795eb5a697a9/jaxemovadobazoropifenu.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160828b16c7612---46529457320.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092da89e510f---93158557355.pdf
    • http://classicalgardenornaments.com/uplds/file/23886511324.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/13738424f48a441ad74549987cc5e8aa/zijef.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160afb37f9929f---69183477804.pdf
    • http://wilkinsconnection.com/clients/9/94/94ba1e7d864c5c8af3bb481f5f9f31de/File/jomipo.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/8c87665767e706b7ce8dcb2584e5fb3e/74073970514.pdf
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/1477b59febc0e031f513f2e7b6e389c4/jokozemejinulapafoli.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ed937272cfd---wawepodiripe.pdf
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/905555b8a24bc38ea961acb205b7f266/43106066011.pdf
    • http://topspeed4wd.com/ckfinder/userfiles/files/bezezef.pdf
    • http://mpu-beratung-brendle.de/userfiles/file/90109264825.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5e37fd11be---zuridekeru.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/jhnun104f5oka6crv6kob98o1m/fizelegezilugiruzodu.pdf
    • http://alt-1c.ru/userfiles/file/xelipejiruwigawowisodidek.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/f3be89f92faefa9ba1435bb1e57be175/73791277459.pdf
    • http://www.drivingschool-brno.cz/files/files/42959346439.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/a4bgjja6tac2f0hg8oov7d4g27/45790807345.pdf
    • https://035620126.tw/upload/greenkitchen/files/83766776884.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=introduccion+a+los+libros+poeticos+y+sapienciales+pdf
    • 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_off0000ecc8.bin
ea4df83083ea218999b26293e1409f550ee140879006418d2598c16a011a334c
pdf-font-stream PDF embedded font (sfnt) at offset 0xECC8 10916 bytes
font_01_sfnt_off000105fa.bin
2918b71467c74e2bc379e58d654766fd9a1bbd54604cfe1fe275d1fe7e4fb584
pdf-font-stream PDF embedded font (sfnt) at offset 0x105FA 17636 bytes
font_02_sfnt_off0001326d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1326D 16792 bytes