Malicious PDF — malware analysis report

Static analysis result for SHA-256 2839f4041a2d8016…

MALICIOUS

PDF

76.4 KB Created: 2021-09-07 14:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 002ca9b7d5d828672715bc6ad29bb5fb SHA-1: 3851cc35f022395bce098f6793ef377eb6930b82 SHA-256: 2839f4041a2d80169ce9b5e2a3333e8df038673db338ac4087c41d906ffb94c9
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 document functions as a link farm, containing numerous URLs pointing to potentially compromised websites or phishing pages. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to lure users to external malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=askep+febris+pada+anak+pdf
    • http://karimeh.com/public/userfiles/file/titalunikavovibawuludaf.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1610a7ee80c4cd---41772381663.pdf
    • https://louvre.lv/res/wysiwyg/file/pukapazomibukepedusoki.pdf
    • http://lumieretvie.com/userfiles/file/95007057717.pdf
    • http://nuraski.pl/wsg/userfiles/rawamilo.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/0ffc9a6b3a4c7d529e60e6e49533d4f9/34976948737.pdf
    • https://doosradashak.in/ci/userfiles/files/89053597490.pdf
    • http://gps-tw.com/CKEdit/upload/files/wotubikelid.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7133e0264bbf83281b4794ccc57b7d9b/kebefijaginom.pdf
    • http://minhvuongthuphap.com/upload/ck/files/niraruma.pdf
    • http://bluebossa.pl/files/file/kakax.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/7e50f6098202fb4a76fd373fd6d9408a/58233536483.pdf
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/83895070577.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/161029f5203710---nugebofozefoxujogaf.pdf
    • http://theclubburger.com/uploads/files/nenonamaretek.pdf
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/cb8d81f0ae1a88ec36cb8e5a74487272/puvesidefimabuke.pdf
    • http://terezmisszio.eu/files/file/15505425401.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/6346394c68dff9a4d600bd9425a28a64/fedizekusajenodewa.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9d445ae53---34049560370.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/0118320f2711cb426b49559cbb2fc0bc/fosufebelunidat.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608de24e538b1---tamaladefagukolom.pdf
    • https://grupo-kayros.com/userfiles/file/34931795624.pdf
    • http://www.predia.cz/userfiles/file/mavupejoguwanaxabapig.pdf
    • http://conhantaoankhanh.com/webroot/img/files/kawunozil.pdf
    • http://turinhotelcompany.com/userfiles/files/17836751414.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_off0000ca26.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA26 16792 bytes
font_01_sfnt_off0000e23d.bin
af43f2673f655de74012bc26b1beabe485d1f3ae8d8f78247e495dd51e569268
pdf-font-stream PDF embedded font (sfnt) at offset 0xE23D 10440 bytes
font_02_sfnt_off0000f9ca.bin
ed0fc3769fb87c424f594a7060c16f40251376faae9578098c97af95411fd3a8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CA 16416 bytes