Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac12f6484e68e627…

MALICIOUS

PDF

78.9 KB Created: 2021-09-07 13:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 748bffacc86270228ff90c300f26b37c SHA-1: 189483aab724567a17cf0c0b1ea8bfdc29b31511 SHA-256: ac12f6484e68e627b71e36271958a61f84e10254311e5a5082a9751d59a08069
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to websites hosted on compromised CMS platforms. This behavior is indicative of a phishing or malware distribution campaign, where the document serves as a lure to direct users to malicious sites. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://alphamarino.kz/images/news/file/31993571234.pdf
    • http://studiodabo.eu/userfiles/files/80972262914.pdf
    • http://tsrmmessina.it/userfiles/files/530282521.pdf
    • http://cec-intl.ru/app/webroot/files/file/gezofedafogewenowu.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736a6dcdc06---17114793753.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e47fbf8a714---xoxopene.pdf
    • https://etadelloro.it/images/file/41276124542.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/2q0l4io7achbfmnmhrvcisici2/kigokapefogejadulopewuku.pdf
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e81ce5b63---kogazejofa.pdf
    • http://someteme.com/archivos/_20210620101309.pdf
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/83716877168.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/1c946ddcdbe22028c955aaf8bcfca1b3/ganusonujiwewoxojusil.pdf
    • http://birnagarcollege.in/userfiles/file/mawetikofo.pdf
    • https://abeess.com/userfiles/file/vodixevixojurokapuzo.pdf
    • https://gretajensen.com/ckfinder/userfiles/files/nimofujegenaxitaxila.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/v8lae0ogp1qe5e922mol7v5fm1/5839775615.pdf
    • http://screen.by/images/file/varuzesaninerotisakajadip.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a326dd3c44bf3aeac55f447c9a03adb3/4124679419.pdf
    • http://etenindex.nl/images/uploads/foforojigagiguluse.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160736a16591e8---zowovogemebemisamiw.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e40eec69e---89082109042.pdf
    • http://niestachow.pl/data/aktualnosci_imgs/file/55446026549.pdf
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/felejaposirod.pdf
    • http://schodylux.pl/userfiles/file/fulobimefebat.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075eb6101b9f---99363057013.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=dutch+dictionary+pdf+download
    • 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_off0000d08d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD08D 16792 bytes
font_01_sfnt_off0000e8a4.bin
85573a9065c22d1be6dd9c7bcb6edb2b61ce3cf0c50bff1d8314d7e7184f5d34
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A4 10720 bytes
font_02_sfnt_off00010146.bin
22f1aaa6146cc637e1c6c06c283dac0bf82908694e33795b8806084fce73b53f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10146 17600 bytes