Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8a3761b5218a27a…

MALICIOUS

PDF

90.6 KB Created: 2021-06-29 04:59:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 94f64867d64fb8cb9c892629ccaa9a79 SHA-1: fac91410ef96db3b90523854d42b2444ccdd6c95 SHA-256: d8a3761b5218a27ac1d18bcea7536b699520f7291b8e8dc71b8640305ef1261a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to numerous compromised WordPress sites, suggesting an intent to redirect users to malicious content. The presence of external URIs and compromised CMS upload links indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/4d2cdaf4ee2292e73c5efa8d87c69113/52343941794.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be5d679382a---guzodok.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/9932faf99882fa85ff17c57bb58bf0d7/gixozoxifat.pdf
    • http://ha-sine.com/d/files/84381715243.pdf
    • http://dungcubepgiangtrinh.com/webroot/img/files/99988832406.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/229d8e663ca07c2513895a2496c4766a/jenefagewuvanow.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078446be1a00---zarebigalimuzovubo.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb65f99eff---kituwifipoz.pdf
    • http://zabradli-znerezu.cz/userfiles/file/wapebesokelasemubakodewu.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2f1d01731---fimesanonoputukolus.pdf
    • https://majorsagilekvaros.hu/uploads/file/botubegitojef.pdf
    • http://gocep.org/data/userfiles/files/41668127730.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d80cae701---futirudogudojin.pdf
    • http://wirheiraten.de/images/file/26628713955.pdf
    • http://bpsstudio.hu/uploads/39277706208.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/9c1e8bfe11fbbb2d8a217e75ba54675a/ragomafuxuxibujumusix.pdf
    • http://alexanderkanevskyartgallery.com/clientMedia/file/kamepafejoti.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9518b2e17---dumivora.pdf
    • https://alshaabcoop.com/userfiles/file/12982778505.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae0712cc87---faduvadowudukelogejoro.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/28f36367590799b497e0cd504e069c14/ronuwelupikemi.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3275f57465---jogabefela.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609594845c596---72710900904.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/3429a4eb1ee03ddb38c629b1d4f99b7e/pixim.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=s10+t5+transmission+fluid+capacity
    • 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_off0000ff8e.bin
028f18c157ae86a2e8285e9b07686a5c4230082864b45cdb4c82a97185a0d730		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8E 11244 bytes
font_01_sfnt_off000119fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119FC 16792 bytes
font_02_sfnt_off0001320e.bin
a1f5f9c83bad8f35c575d4df51ad552dbe3c54e9dcd92668e8856d36560bf780		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1320E 16724 bytes

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