Malicious PDF — malware analysis report

Static analysis result for SHA-256 c03bd3410ac8f961…

MALICIOUS

PDF

88.5 KB Created: 2021-07-09 16:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03f21fbdcadb6995a5919d6104ac0cf5 SHA-1: e00e0badde9df2a12359564dbfa3c2b27477ceae SHA-256: c03bd3410ac8f961fed4fff8145f1a6ddf45a24632d2a68d5b34058ffd9fbba7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9804

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://tcremich.lu/files/files/7615452409.pdf
    • http://clarksville.net/wysiwygfiles/file/26580365648.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/7b2gn5n86i3nfklkmdemulna91/18976424443.pdf
    • http://williamshudson.org/clients/3/35/35bf74ce48b5c120232fd40fb4fe3e45/File/12347958717.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072cedf35b67---15937292609.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e2587948ebe---rurajoxudovok.pdf
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b47cd0b38---tixuvuxapekajelo.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/17fab413b0e0d08f2214ee434652cbb2/nederekin.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/q7ukqauio50tsitaflae4q5n4v/pisemokinelizofapawugevo.pdf
    • https://terminal.hr/userfiles/file/77237119424.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/a1829b79a506f64777f59ea61426863e/52685975794.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/1b25ed5b4919f09af40b5618ad1ffa38/rigipekanavojinumizoz.pdf
    • http://openendrep.com/userfiles/files/41992388324.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0342864173---sisuxupelapubolujo.pdf
    • https://thehideawayresortpattaya.com/userfiles/files/68457902785.pdf
    • http://stellarvvv.ru/ckfinder/userfiles/files/38559867000.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/0123881e317f5e873fe18b5acfa33412/71372250113.pdf
    • https://planet-pvc.com/upload/files/60923375955.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/66a74a7e97b3fb3613d3d90bf3148abe/2669364533.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/1724a740961294ccb147e894a15ac8de/72272972905.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16079c32642ea2---883567563.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/fa3db2ee1194ccd00d871dc0fa392aaa/gevujijofoxerototekazesux.pdf
    • http://angelofthewinds.net/ckfinder/userfiles/files/gipezezavolakaf.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/fe46f325b164c13c22cb82256c470560/kalejamawovofetitanugus.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609c889165986---dejemoxomadok.pdf
    • http://health-bridge.in/upload/file/fezebijopuweromuv.pdf
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/674c908f30af64a17ac684a397d13e2f/39162956921.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=cardi+b+and+megan+thee+stallion+grammy+performance
    • 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_off0000efcd.bin
a0f3a5cadc1ad56bac10e5ff93796d36fb2dcb5510e84874fe9aa89e5d77c7a3
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCD 11352 bytes
font_01_sfnt_off000109e9.bin
39149ace5f37face7a4b127b1e0acf74a78ac1ef8f8eb1f2851b1106a4300098
pdf-font-stream PDF embedded font (sfnt) at offset 0x109E9 18476 bytes
font_02_sfnt_off00013a32.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A32 16792 bytes