Malicious PDF — malware analysis report

Static analysis result for SHA-256 410f36a1fbaa9023…

MALICIOUS

PDF

86.0 KB Created: 2021-09-16 17:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 96ebcc7a64a2923a74ad8ad95348defa SHA-1: 52f044ae50790015f54d33d3ddb7df9510bf6491 SHA-256: 410f36a1fbaa902322ed96ae0a5c9092b258f3acd167040814984999c241c0e1
204 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution document. It contains embedded JavaScript and a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The heuristic 'SE_SECURITY_BYPASS' indicates the document may instruct users to disable security software, a common tactic in phishing and malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=getpcsofts+after+effects PDF link annotation
    • http://fotofolliasanlazzaro.it/userfiles/files/buleloj.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/lujosuponis.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/42006918392.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/35908450363.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/70625017263.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/36020583932.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/58004589878.pdfIn PDF document text
    • http://rafaelokazakov.com/file/misotasan.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/47890651680.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/sodawotutader.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/povulimusepukopob.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/dukifunumegiroko.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/pojukazasituz.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/5496702409.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/10579953828.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134087e837f0---xoxufusiwuxetopa.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/79503152384.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161335d9147b56---22835508119.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/161345da01fbd3---tabonaz.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/bubamogukiromineton.pdfIn PDF document text
    • http://paulabenveniste.com/UserFiles/file/zopaz.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/56503078230.pdfIn PDF document text
    • http://108shiva.com/userfiles/file/In PDF document text
    • https://businesslife.com/content/files/2268261355.pdfIn PDF document text
    • https://wasael.com/userfiles/file/bijurejelo.pdfIn PDF document text
    • 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_off0000ec0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0D 18280 bytes
SHA-256: 18e836a0f92b24452aeb43eb462825763425fc58b9446ef8e7badefad86fcce4
font_01_sfnt_off00011b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001336a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1336A 10272 bytes
SHA-256: 79e4fe2522d780d10937a6f137d725238ce8dcbc2a053d1eaabb9ee374c19b2f

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