Malicious PDF — malware analysis report

Static analysis result for SHA-256 91a5987bee6cc28e…

MALICIOUS

PDF

77.7 KB Created: 2021-10-01 08:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7d1986b10ed975e3eda3eccd5fc91928 SHA-1: 697e3095f15b3316908f3b24bf84698a4e3b8bbc SHA-256: 91a5987bee6cc28e07f50ec972336a094c127ec5128bc836dd723c490be6505e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. Heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple PDF link farm indicators suggests a deliberate attempt to obscure the final destination and evade detection, likely leading to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/fosawoxasixev.pdf In PDF document text
    • http://paraglider24.de/pics/fotos/1/file/xegare.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161396c1bad35c---mudepuxuxujomituzeg.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161485f7c859ff---wanatewazenijo.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e648625ddf---22986576562.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145f40a524d0---43078297083.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/69412600409.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/83605714942.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/70839160913.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/33258797460.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/57603577302.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/vewesumutagu.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/65903065977.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/ximogekujagazanodisela.pdfIn PDF document text
    • https://investir-petroleo.pt/ckfinder/userfiles/files/sakevataji.pdfIn PDF document text
    • http://kme-kme.cz/files/file/wanijerawebufe.pdfIn PDF document text
    • https://biomisszio.hu/tmp/66536870488.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/90050529027.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/60242743123.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/vovudoxijudepozegujare.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16150ee17373ee---kovumuzilazuw.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/fojogisurisilazerikatiw.pdfIn PDF document text
    • https://gtpoznan.pl/cms/files/file/bovositalazudenez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=happy+tree+friends+deadeye+derby+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_off0000c427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC427 10692 bytes
SHA-256: d18df5d7072739efe03c218585a4a7ed0bf91360eb44495d8e6da6b6b68265b9
font_01_sfnt_off0000dc90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC90 20092 bytes
SHA-256: cfc7e7174acbf5a6ad65735dabf6756dfe2e8a5ed62717d8f21a29293f71c427
font_02_sfnt_off000110bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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