Malicious PDF — malware analysis report

Static analysis result for SHA-256 13cceb38a5625a66…

MALICIOUS

PDF

80.1 KB Created: 2021-09-02 19:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ea34fce4d2ed94a7d267d6802803f2fe SHA-1: 124ae9afab63584df3eb22cc3dc7f8a18f101ea2 SHA-256: 13cceb38a5625a66bba5c46f341b39cb57e4a4664041438dc91d7a38f353a106
156 Risk Score

Malware Insights

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

The PDF file contains a link farm that redirects to numerous websites, many hosted on disposable domains or compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish or distribute further malware. The embedded URLs and the heuristic findings of a 'link farm' and 'compromised CMS upload' point to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://aceonlinementors.com/userfiles/file/pogofisipototivegodamenuz.pdf
    • https://ntiverification.com/userfiles/file/12948841528.pdf
    • https://gonguyenkhoi.vn/upload/files/fovesa.pdf
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094316c0c3a0---84031678504.pdf
    • http://archissimo.eu/userfiles/files/23414593329.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/a588d87485ea2e3b8fb144d07d598216/vabulijefitawuma.pdf
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/rurotawikax.pdf
    • http://myflora888.com/ck_files/files/81984281410.pdf
    • http://upoart.com/ckfinder/userfiles/files/mabizatetiluzagisilate.pdf
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/15312210911.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161207a8d9c09d---medetewusexarebep.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/a24elghd59m7bsuhks9vuc9ok5/72070132633.pdf
    • http://ecompletecontact.com/ckfinder/userfiles/files/19209343496.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/bfc797ed6303ea4e26b6e513759c392e/vezulezetog.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/56762d46bff73e76154ba8e2af5239cc/60154232186.pdf
    • https://beatmuellerfoto.ch/userfiles/files/61055111402.pdf
    • http://veterinariacomportamentale.it/userfiles/files/dowisukodedizefa.pdf
    • https://abugfreemind.com/userfiles/file/66350394186.pdf
    • http://thebankcardservices.com/uploads/files/51715436090.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/504fcf7ecd7c60982e05e59b6a88cd15/40228489088.pdf
    • https://samsungklimalar.com/upload/ckfinder/files/bumokezuruwefokajewi.pdf
    • https://alate.org/admin/fckeditor/editorfile/gidumegazolejorosisavi.pdf
    • http://fratellibeninca.com/images/file/24903933280.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/0c06cabd3486a19b9d84660b1d308f4a/70280086328.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=paduka+sahasram+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_off0000d610.bin
5fc34adb2cc44bd3d8cd48daa5e4e50a93b078d16c22c02d378fa827bbe3871a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD610 10364 bytes
font_01_sfnt_off0000ed73.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED73 16792 bytes
font_02_sfnt_off00010585.bin
f0e224dcc87388bd80bd2371c3cc0956fb54c01ab0fe86193e76b22fd8cdc4f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10585 17668 bytes