Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8f53a70e8795756…

MALICIOUS

PDF

91.7 KB Created: 2021-09-06 13:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b43493f42ca6a6fd9b5b15c3bf18f4ce SHA-1: 33731adc3d2e48fcb0c349de040ad6c04abd1209 SHA-256: e8f53a70e879575650a3c85bf37ea39f8ad3ed5a6c8ce1c1d76f4f1dba4e4a76
184 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it contains a link farm pointing to compromised WordPress uploads and external URIs, including one using a raw IP address. The presence of a 'download button' lure suggests a phishing or social engineering attempt to trick the user into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/f05d11eb7b490c0b28ecb65a30cc8dc4/50844760307.pdf In PDF document text
    • http://apicn.net/upload/files/kojufivikudulejamisomave.pdfIn PDF document text
    • https://singlespeed-switzerland.ch/userfiles/files/dedefowulo.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/zubobixorikimomufi.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607069e1c3b49---66575533600.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/fefopegirajulu.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/5ap6sslddqe63s00m1f464ji9i/jigibufifuxofefanuto.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/0f4a225d9ce0728968081bca6d4c45ae/difujewupisazitemiwav.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/24396242121.pdfIn PDF document text
    • https://codecs.ro/images/file/loxekikufuvu.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b01cba9e65a---korup.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/7e5712a88987a15539076e244a28c011/punejiwativasuzatotobuw.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090864a78ed6---16563267968.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/71771763301.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/xivukadedaz.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/2777810338.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/fbde75fb834faba6fca49e35dec1230b/nivesirosobadetaxaviguduz.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/posukewujamud.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/eggrr2are3iqehtpl14bbrjhv5/lanajuzenolubaduk.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/55472219647.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/433f4cb4c7f316699f86f3d0bdce724c/69549374877.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/gateratotalusave.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5809a46993---nuduw.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/98651976312.pdfPDF link annotation
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=gpsc+mains+paper+pdf+downloadPDF link annotation
    • 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_off0000fd86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD86 19148 bytes
SHA-256: bdc71546c5a2c764e0d59619f8aa9fe9f6c2adf7283024af1aefa994793726c1
font_01_sfnt_off00013024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13024 10808 bytes
SHA-256: 74ac1c98d66ae5a3853b2e29006d0f6a408c7da5ce8a384aed692e54f1127b3d
font_02_sfnt_off00014912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14912 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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