Malicious PDF — malware analysis report

Static analysis result for SHA-256 459b35fa820b50b4…

MALICIOUS

PDF

82.7 KB Created: 2021-08-16 03:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 90be40dab1bbaed549b03b92e7e73c54 SHA-1: fbc844668f5213488795aad1efa1c3051e0912ad SHA-256: 459b35fa820b50b42795680b4d0b7cec3f5c62fba0f653d14683bdedcaa66f8e
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 a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm or redirection mechanism. The primary attack pattern involves directing users to external URLs, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://infrive.ru/uplcv?utm_term=blockman+go+mod+apk+unlimited+gcubes+%282021%29 PDF link annotation
    • http://quincy.pl/ckfinder/userfiles/files/20854146920.pdfIn PDF document text
    • http://thegroverestaurantnj.com/userfiles/files/72322229818.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/44262663206.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/xidopijevomidumi.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/3304057be93899671314f54c14bf23fd/pedesamoluwomufuwaxabajak.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6402bac4f---dobawekulovemawukolefefu.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/93781666261.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/e89fcb6045c0847ab25da4fe520eaa57/wimadem.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/a8o06nrei0l233dos2b65rt6vj/doludavujuterusumujogope.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/eb95b8e773df92cabcec5724aeaaaea5/46916394147.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/fonenunenobar.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/203b38edd12cd0fb13ba7cb3dc39f11b/50377628366.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/beguvo.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/envabf6pfa1unnu7tqn0chsie4/pugazifo.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/93802588886.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/53498502123.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/dewitekosumevojuzulowe.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e943476b58f---46633137824.pdfIn PDF document text
    • http://roughriders66.com/clients/f/fa/fa96273273f04fd2a06feef12b1e4d70/File/94700227805.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/15634818978.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/tumisavux.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16087a13a9e3b3---nuparenutovo.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/oj27m1o5t0m73ii7u5e92eabr6/21888326598.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD835 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f04c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04C 11592 bytes
SHA-256: d939284f5b78a3e97064462a8246141dbe0e7bdded3c1eeeedd35bccf13aaf60
font_02_sfnt_off00010b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B97 18956 bytes
SHA-256: d58e12d39682aedca09a211ada9d7a842343afb21927b61959f0a894de3d8418