Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f75bae6affcaa11…

MALICIOUS

PDF

82.6 KB Created: 2021-09-19 03:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2cbf9c74d0b91f4b42679c47e0a249f9 SHA-1: 78b8f556a5f00ce5e77e6bc1dd543e473937df7b SHA-256: 6f75bae6affcaa11b76dfc78374db91c874a602b992627cccc2e6f74402dc0a5
196 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. Heuristics indicate it contains a link farm pointing to compromised CMS uploads and disposable hosting, consistent with a payment redirection lure. The document body is heavily obfuscated, but the presence of embedded URLs and the nature of the heuristics suggest the file is designed to redirect users to malicious sites, likely for phishing or financial fraud.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://nfc-lampang.com/user_img/files/julufakarubofat.pdf In PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/20063779566.pdfIn PDF document text
    • https://durimawar.com/contents/files/96746679216.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f49fb3cdd5---14962950052.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/romoviniguti.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9ce65610e---didol.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22357266673.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/25763007029.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/24065404037.pdfIn PDF document text
    • http://unibox.lv/files/text/jotofavamugozaxag.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/xodoluwavikobinalavijak.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/semuvuze.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/samizeridupupawukokap.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/15978383092.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/97978150712.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/nizovanagixake.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/rozag.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/bogovukoguxitutabelikamiz.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/zirazidupaf.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/95127462283.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/9e3387800cac89b2132dd66dd8b3e398/wesinimalubudovo.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/zanetoregulivewipifawelit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+clean+up+data+on+androidPDF 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_off0000e0e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E7 17092 bytes
SHA-256: bd564444a9205188d31aa552f9eb5b0839c121508454c95fe04fbc60a5df0231
font_01_sfnt_off00010c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001248a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248A 10516 bytes
SHA-256: 8c9cdbc9b0bad2cebc1ca6b8c480a848fa27ac1b64e1fb415672dad859c0aaff

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