Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f45fb5d31a1a8b2…

MALICIOUS

PDF

80.5 KB Created: 2021-09-08 10:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5d79df80b8ff63c30485de32a83f13fb SHA-1: 996d4d283360a366d637e9bf2d2a040c08ebad37 SHA-256: 6f45fb5d31a1a8b2e64cfe66a00d576d738e66b420e99b8774786866826765ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV. It functions as a link farm, directing users to numerous URLs, several of which are hosted on compromised CMS upload storage. The primary goal appears to be luring users to potentially malicious content through a deceptive link structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://briquettemachinery.com/d/files/mivijoja.pdf In PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/59545791984.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/snk155er58b1k6i5qn75oi9f8q/fugedavumulavupekegisom.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wigatifabudibenugutumiw.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072565f9674f---10902263821.pdfIn PDF document text
    • http://barexkft.hu/userfiles/file/48976885686.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/mawukekajatowor.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/29667909410.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed908da7e2---33584318053.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/82798416752.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/leziwugorosukiko.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607c868691be8---24839952305.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///60313617642.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/32355701787.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/ffeafcc157b68c823aee8532801e2cd6/16582770680.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/92415398982.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/718543f61773c074505273947bfef139/53351619192.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/ba4991bc05371f665d69670d87ba3dcd/71438637664.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/zolopudugukadu.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/vaxowurujiboku.pdfIn PDF document text
    • http://bigredclassof1960.com/clients/879476/File/gobuvejafipokodujifud.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/kububowimigekufaxov.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/94342992482.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=image+to+pdf+generator+onlinePDF 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_off0000d7f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00B 10624 bytes
SHA-256: de41ab3b2e6f4feee277ebdb2e37255ed75f34b9c076d5b576113b68ae50758f
font_02_sfnt_off00010804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10804 17204 bytes
SHA-256: 381b03cef0b295460bd29172f115f76c7720dd38add5240123caec72535545c8

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