Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d3b2fabb977075…

MALICIOUS

PDF

87.3 KB Created: 2021-07-05 05:01:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5fce4501c7d7204b91c5ffb530fbd3c7 SHA-1: 982894a84d0b49a947f181b639024990a7386c34 SHA-256: 83d3b2fabb977075ec300c552845b70953ee131a12ca3f46f7591072c0747067
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/691e7b44d204ecdda90bc0b42fdfad63/rudowaxujumifiviliwon.pdf
    • https://mujeresenmovimientoplus.com/userfiles/file/pitojuje.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/c4be7a7b25dfe529da4c4757bff8f21a/55218692453.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d13f5ec8f---nadibiwoweget.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/21c1e4eecb82373c0c66bafc7d68d733/mesudunizopap.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8hfccuidrparv5oi68hkv66nu3/63242917642.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160982800a8ba2---93542936048.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/09quuj23be3arr4enqp94iibnc/35273637479.pdf
    • https://eberli-medical-supply.ch/userfiles/files/40823394157.pdf
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/penujevo.pdf
    • http://meble-tk.pl/userfiles/file/42115581750.pdf
    • http://geoass.eu/userfiles/files/gibivujotuze.pdf
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/nesirufumopa.pdf
    • https://akapacha.com/userfiles/file/23819568585.pdf
    • http://mamam.by/upload/File/file/50268676709.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608512dfefc83---20683073710.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/7bf40a2468c9daac6083e1d9588059ad/lezedozasidizotolelo.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3127c327c---63133916778.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089974ca5d02---93787100742.pdf
    • http://nousgarage.com/userfiles/file/wewunufaberebokemamixamej.pdf
    • http://beautifulmoda.com/userfiles/files/tofebujamemikutukef.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/a1042339a4be06416de6c69ada0a4852/17757133983.pdf
    • http://absolutelyneon.com/userfiles/file/fenovoluv.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/b97vi1i7pq76qmg7sfs1kvebjh/58681697919.pdf
    • https://vokalensemble-vocembalo.ch/userfiles/file/botajetejevogirajivoni.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16074a79b66866---leraboxodediborigakozob.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/d755bf60c4e7279a606106f5a71a5e8d/31429185597.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=indian+movie+mp3+download
    • 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_off0000f2e0.bin
36c2186622e62f748e745fafacc5cd1aad8c5a1d001b2b0477f59748b8a968b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E0 17188 bytes
font_01_sfnt_off00011fe2.bin
b23191a344e9f821832f83f5e4a24f06e91a92ab431b167bfe35a193a1f189ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE2 10460 bytes
font_02_sfnt_off00013790.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13790 16792 bytes

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