Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e5980ff7a3b330…

MALICIOUS

PDF

86.7 KB Created: 2021-09-13 16:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ecc0d71f0b47b875932d8e167fda62b3 SHA-1: 23951f569f3d9eeee7e1135ae6e5ff85e18e136f SHA-256: 85e5980ff7a3b3304703a1208a980d954e4ed96e9ee2f494d013ad409e81b47e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution lure. The embedded URLs, while some are confirmed benign, others point to potentially compromised sites, reinforcing the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0b52eed37---78123002176.pdf In PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/migovamiruwabunulalobo.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/jamuxitiful.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/kagipomuf.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/josisigonopevomewik.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/66226124776.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/9462723763.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/96276551519.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/sofanimokoponururebejufa.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/farudugimuwemono.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/pibewelaxopukumuvobisad.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/91940957815.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/22658258db1b548275f15bfe21a09682/nugatakuvufifibemuvedalu.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/48390859519.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/kuxowomeveboduzaxu.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/sajotunoveteduluvixisuma.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/77325390204.pdfIn PDF document text
    • http://rapet.hu/files/ganijomopuzarebubosuma.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/fugopijopogizuzemefepok.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/boxapuvakatibobosujixe.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/wesesojejifimojug.pdfIn PDF document text
    • http://askort.pl/Upload/file/73795842180.pdfIn PDF document text
    • http://belean.pl/userfiles/file/rigefenibi.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16138719a04e56---gukidegebajogefuramureses.pdfIn PDF document text
    • http://le383.com/uploads/files/limuwatedika.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=bluetooth+sniffer+android+appPDF 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_off0000ecd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104ED 10748 bytes
SHA-256: 2d110dac0435350953c0da2e3e9ba191b3a8aab5816323ab5e23953df796c524
font_02_sfnt_off00011d95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D95 18056 bytes
SHA-256: 30d3ad57b83761f7e20a7295c296924a46c0191fffe748c020279488c503e4c0

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