Malicious PDF — malware analysis report

Static analysis result for SHA-256 cce74b9fca9cad26…

MALICIOUS

PDF

93.6 KB Created: 2021-07-06 02:33:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2ba760af813256b6a5900140fc848edc SHA-1: 30e01b62124c12973e32711ba03d13de7a19e684 SHA-256: cce74b9fca9cad265c1a45b8669d619f44a8a39279e41f5cbed0094b8f15160b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a link farm and a fake invoice lure. The embedded URLs point to compromised WordPress sites, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing campaigns that often employ JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/2msgdc1a68plaffgdb0p662i64/42608118462.pdf
    • http://vladjurnalist.ru/archive/file/gidapewofimavofogel.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/qlbq82rrk7dr0gess2u09n5uf3/jelepaxuvas.pdf
    • http://machinegroup.ru/img/outer/files/62814501838.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2f3f3710a---kaxomarasa.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ef8380bc9---pezotinisanolik.pdf
    • http://matstravel.ru/userfiles/file/larubateviduwazodonor.pdf
    • http://xinyaoqiye.com/upload_fck/file/2021-6-4/20210604094458533331.pdf
    • https://copab.tn/216mag.svn/uploads/files/wovera.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984b9358bd6---jedukirorirujowugudujemad.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072aeec8cef1---samomopafizetepubuf.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096373a071e8---wirisutezexop.pdf
    • http://niszczeniewaw.pl/userfiles/file/bovelasagovagerexanutoz.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/gakq0opco1e8m6rjlt67n0tk83/vuxovukimoxot.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c5006725f00---25458456707.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a28ea961d---xiniropo.pdf
    • https://brickbodysupplements.com/newerac2c/userfiles/file/15910661357.pdf
    • http://eprdel.cz/userfiles/file/somusalobebujovaxexadefe.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c87fd3ea7b9---wigewobapolivalagupiv.pdf
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/75703248179.pdf
    • http://sfera-vlad.ru/img/file/93088984965.pdf
    • http://jnnycc.org/userfiles/file/talakowenu.pdf
    • http://china-zub.ru/userfiles/file/7593453316.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8d60dab8f---66007515575.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=2nd+puc+accountancy+question+papers+with+answers+pdf+2019
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/ac9aec66600e6abe20db22d628f55365/85055259852.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efaa.bin
e113bf7600b68ea6217f39ca26884c5f73d4723c71d6bcf84246aafb0126745d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAA 11480 bytes
font_01_sfnt_off00010ac0.bin
6d020052021079c6fa3d13323d8cbc599610afca74243fd53da005eb3559ccf3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC0 18220 bytes
font_02_sfnt_off00013ab2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB2 16792 bytes
font_03_sfnt_off000152c3.bin
450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
pdf-font-stream PDF embedded font (sfnt) at offset 0x152C3 16088 bytes