Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c6ca966e13ea3de…

MALICIOUS

PDF

84.2 KB Created: 2021-09-20 18:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e61997a0bd0aa3663c000f6be427b36 SHA-1: aaae63c93d3c15a8565c4ca62fba2537ea91a499 SHA-256: 8c6ca966e13ea3de7b2c1b43c43f52ea6ae39896f2583bbafd49952a6cf52484
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or malware distribution lure. It functions as a link farm, containing numerous external URLs that point to various domains, some of which are hosted on compromised CMS uploads. The primary purpose appears to be directing users to potentially malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://crewmak.ru/uplcv?utm_term=where+can+i+watch+the+matrix
    • http://microsolder.hu/userfiles/files/55527835479.pdf
    • http://lovesenergy.com/file/37925255283.pdf
    • http://eviljoy.com/UserFiles/File/vitumaku.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419de15beff---42390177012.pdf
    • http://dpsszczytno.pl/photo/file/wemebekidutuvataja.pdf
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/nisejut.pdf
    • https://penzion-pod-rozhlednou.cz/img/file/serivawawilemiv.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161342b4419dfe---dubekagopixubibam.pdf
    • https://cape-electronics.com/media/file/sowupe.pdf
    • http://mehmetrasimmutlu.com/icerik/file/xejimune.pdf
    • http://nationshield.ae/userfiles/files/33609953766.pdf
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/8824086132.pdf
    • https://nevjegyzek.eu/uploads/file/bakagafupise.pdf
    • http://jadever.vn/Images_upload/files/84465496130.pdf
    • https://vinocastillo.hu/editor_up/xalel.pdf
    • http://asijskepotraviny.cz/files/file/64680727291.pdf
    • http://cka-shiba.com/ckfinder/userfiles/files/gasasikowe.pdf
    • http://barcelonasixtytwo.com/userfiles/file/bejofager.pdf
    • http://sloplast.com/userfiles/files/31467972513.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146976f2f84e---gatif.pdf
    • https://dotcomtravelegypt.com/userfiles/files/78078519069.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385c3cab404---42319438125.pdf
    • http://energo-winstal.pl/userfiles/file/sezezufamuwegoda.pdf
    • https://fishuntpesca.it/file/rojifewigiwulu.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/59b7fa71b2cf372271c180fb28413a3d/duzifelu.pdf
    • https://easyown.ddproperty.com/datas/files/70615388517.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_off0000e41c.bin
980c7a48ccfcc0e71947627b33846e8d3a0531094da0c8b3a6ca77cfab9e0482
pdf-font-stream PDF embedded font (sfnt) at offset 0xE41C 10344 bytes
font_01_sfnt_off0000fb50.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB50 16792 bytes
font_02_sfnt_off00011362.bin
824f76e2f10204d3e1138322bfe600e3803620edddaa1d5b5dd653c5b37fb692
pdf-font-stream PDF embedded font (sfnt) at offset 0x11362 18556 bytes