Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebdc8b49ecb53326…

MALICIOUS

PDF

86.5 KB Created: 2021-07-17 03:35:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e98afbb36834290f3625e834ab2dfcf2 SHA-1: 95c92336b1b44b05bf1768c71437cb6bf26a147c SHA-256: ebdc8b49ecb5332665d85bc6ddae0f273a8a2dd1c094234336280d9d138f4a5d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics suggest it functions as a link farm and employs a social engineering lure to trick users into installing browser extensions or updates. While no scripts were extracted, the embedded URLs and the nature of the lure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e579713f0---fetifazolenixatokudolofud.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c221dc181---79748681525.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/ch1gcns45r9l97u2qtm9ks89o0/momegidekajarugow.pdf
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/zitosefo.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/b4388bdccea39f069c0b918eece068a1/7601758225.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16080567226f09---gudasetomolo.pdf
    • https://chmelo.hu/sites/default/files/file/42213780693.pdf
    • https://kochitaxirental.com/ckfinder/userfiles/files/lixixuwu.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/3d652b2d874fab8b7fb9014a4ef2b476/20698096806.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a28c22d5461---pafofululonodabipamaxed.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/cf2af57eac500a458c2021bfcc5bc5fe/35065950886.pdf
    • http://alliance-ic.ru/uploads/file/wokaropusexuzugamuxezoju.pdf
    • http://zlato-stribro-investice.com/upload/files/737323392.pdf
    • http://erfaspot.com/resimler/files/1354007074.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/14h5fpjkkg5v5ovteql5hi5fl7/mikonirobe.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/9b179061ee07ac9d49c9282756b3fb9f/89061524860.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837b6e3d365---68757496847.pdf
    • http://ithaca1961.com/clients/875375/File/56904371002.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160909279e16cb---41174549623.pdf
    • http://sansboundaries.com/clients/f/fd/fde0d4b6b324343791c5f0705b221951/File/53217789937.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/bbfc99c5894e5337d0c84a6b812ee11e/zefururiteletuwilunigo.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/80899e783533368d9a57629ce4727a81/69937738774.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/58heacfms4kae220guk5ggeipf/gopebokosaxiz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=portable+foxit+pdf+editor+download
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/41ffa31fc1a9f5a30657abd8386af80a/73965644471.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_off0000eeba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBA 16792 bytes
font_01_sfnt_off000106d1.bin
6db89fe3781f6177037e4bc85e97c6538cf0f824107b23104f13d31e444b12d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x106D1 10652 bytes
font_02_sfnt_off00011f25.bin
6e4c4e691b4461f9887ff99ab9b5c110eeebb64100f172ba15f9eeed4a74ca10
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F25 17380 bytes