Malicious PDF — malware analysis report

Static analysis result for SHA-256 713f88eea9871466…

MALICIOUS

PDF

71.2 KB Created: 2021-06-30 10:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c5ec93c1f0f93f44409083b2c126457d SHA-1: 72c71fa10733a1cbc0d97d8d2acba4b4d4b6b7e4 SHA-256: 713f88eea9871466d6dec4ae4a4eb9770d598120e9cd9e8de29da5a1cb0b0d24
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other domains, likely intended to lure users to phishing pages or download further malware. The presence of multiple distinct hosts and UTM parameters suggests a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://cructi.ru/uplcv?utm_term=pdf+growth+and+development
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/hak161n93rc1osdk8tuhg7l344/nemikozinituvujepojadedam.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/8bd14408ba7c90edcb4821e15e9d9a43/92862050873.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/de884df3a1e0bf626ebbe17c930e0df0/xetuditarakejuninoda.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/h63ug299efbejv52cbh987mr32/wukakotug.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082682b66e00---wadaxoxaguxusalesagi.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/ecbf0702c161af4e2ce66d9e8520222a/75792344225.pdf
    • http://agnieszkapawlik.com/userfiles/file/20061729945.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/39etluqts01oa47c7i6vd3fp06/bowukovoxuniximomap.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c71b62c133---14895274334.pdf
    • http://chokmanee.com/userfiles/file/levetutenemuretit.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/921d050f3694aac2e814da3e35803c74/63102918390.pdf
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/zivigezomepu.pdf
    • http://stellamaris.cz/userfiles/79720667176.pdf
    • http://clubmaniacr.com/campannas/file/pegenutotovur.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a1356c055---52560154589.pdf
    • http://hasici-pristroje-eshop.cz/files/file/jesiko.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/6ef0228af20598d1c9c786a27a5d50c8/92449422699.pdf
    • https://ytdrive.com/CKEdit/upload/files/tujakemivanokomos.pdf
    • https://kurek-rowery.pl/user_pict/file/32731991845.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/40ohcn0t7q0dkeb1k3507b22s4/99618755897.pdf
    • https://anmimar.com/royal/userfiles/file/sawujefonuxoxupeladodujex.pdf
    • http://ekolojikweb.net/upld/userfiles/file/75157983723.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e7f69c89f---xupimufuwawefemaso.pdf
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160849c09eb300---87778919021.pdf
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/34250714049.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_off0000b92b.bin
b8a3020742e8f77c065acd1997a37f2fcedccb2ba84f5d10c880f12b96125a41
pdf-font-stream PDF embedded font (sfnt) at offset 0xB92B 10840 bytes
font_01_sfnt_off0000d1dc.bin
c5adec3e747c3a155f3cd8bdbb972e64bf4ab5e864e38c0e039a5cc2afdc3624
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DC 14868 bytes
font_02_sfnt_off0000f796.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF796 16792 bytes