Malicious PDF — malware analysis report

Static analysis result for SHA-256 619f9ccc2c3b346f…

MALICIOUS

PDF

83.5 KB Created: 2021-08-19 03:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7199ba9ed5b960a548471221315b147d SHA-1: 88eef2053325e8edb0d4e98d3f5f9e9f317ae2a7 SHA-256: 619f9ccc2c3b346f2f70f9a3cbcc513e464b2ed0bd99274ef64cb2a55cc0731c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on potentially compromised WordPress sites and disposable domains. These links are likely intended to redirect users to phishing pages or download further malware, aligning with a common attack pattern for malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://falconfam.com/ckfinder/userfiles/files/28132213187.pdf In PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-12/20210512164753341519.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/2105169106.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/gemilimifesizaxef.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/b30619ec31c3c833279227996f835a4b/pinexilosixotaxaku.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/93357448320.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/34321899321.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/3715ed04418eacbf967ed88f041c5c9e/12689536013.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/wejokiw.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/74050d17c7fb95977bb681cc1a798f40/1181751873.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/dobumo.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160719773da5c3---96966912968.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/senupu.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mogum.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/12619862418.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88a4ec4c30---wonokotasewuxux.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab38ca7a84e---75468921195.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/0jkrmsdpr1p2ru9htoeghk0t17/97260867545.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021051600585873499.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161005f08cca89---tigub.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/75591d72ec989a5c0893146cbba074a9/18516010962.pdfIn PDF document text
    • http://deasreunion.com/clients/860224/File/89086752850.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/nawirijanini.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/6c9f026f3f2bfdc1b9592a117b8c98aa/35148338069.pdfIn PDF document text
    • http://newmanclassof1965.com/clients/4/4a/4a7b3a1a0fb21659e68ac19badabb541/File/30323730449.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=definicion+de+empresa+privada+segun+autores+de+librosPDF 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_off0000dff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF807 17280 bytes
SHA-256: 3a905a3f24141075ccfaee38de38570f423a0cb2184b95bad0d674536624d11c
font_02_sfnt_off00012325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12325 11268 bytes
SHA-256: 15f57632c0143877484855e993af34699f59d304340d61d8213e409b92a79714

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