Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e86f9832e7a2e99…

MALICIOUS

PDF

96.8 KB Created: 2021-07-17 22:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ca90fae6158e29555275048d45d19f75 SHA-1: b5f0a4d410bf13ed2fa2ce2cb9c62f7e74a050ae SHA-256: 3e86f9832e7a2e99e1cbbc84049ffc4cc0e42ae68f44e712eb8a551129ed47e1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress upload directories and other disposable hosting sites. These links likely serve to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 https://lecormier-menuiserie.com/www/upload/files/48626695769.pdf In PDF document text
    • http://olech-rzeszow.pl/userfiles/file/90705473989.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3a9194208---tirefipuxitokapujawogon.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/dukikazokid.pdfIn PDF document text
    • http://oinworkshop.com/clients/6/6d/6d9161a7191ba42f41383a85782e2f4f/File/koxodafojeto.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/xixuwepetewagadewojenux.pdfIn PDF document text
    • http://househouse.it/userfiles/files/65824138174.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/95546990179.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/c92634a7a97804cbeabc4f0a79c0a4c8/miliwuborarapozufax.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/93afab42122645d9e6982ed2a390abdd/turetasi.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/mununaguzozilapaj.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e8b1d9e64---motukig.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/94929922518.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/63416048276.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/13f6f6666de4dbc37a9a15d718b7b49b/72972343809.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3e4493ee1---20916286120.pdfIn PDF document text
    • http://puppiesjust4u.com/clients/c/c8/c8a8d0e690f73854b1e7a5fbb9521f82/File/62282046365.pdfIn PDF document text
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/nejosanasafiriku.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/32200313182.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/33915963922.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/3nvj6dpisdp5rqvr1patj0v94s/mevoluf.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/7327698645632dbf26ee4b837bcd139d/20288023052.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/efbfd6dd7b22e88422a32a65feeb5f38/85821625775.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/63ff762d933b956b2247edda702e0ca8/ferenisikexumidodinaso.pdfIn PDF document text
    • http://www.biologycorner.com/In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=holds+the+objective+lenses+and+can+be+turned+to+increase+magnificationPDF 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_off00011859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11859 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13070 11352 bytes
SHA-256: 4ecd4a9f1e88d5d0996f4e3094c8435030edcae77237f168f196ae3fc0ab7869
font_02_sfnt_off00014aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AAB 16504 bytes
SHA-256: 3f4e488372dea5a10bd672abbb249516d89f725917236a089fe6b11a013576eb