Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fa4a14496069a4c…

MALICIOUS

PDF

76.2 KB Created: 2021-09-16 06:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5eb724e19c111926be047c36e79e1e6a SHA-1: 45a168874f2831bb71c8d1a25684f816bf48f894 SHA-256: 3fa4a14496069a4cc9087f02c1a7060ae8ee9f2cfff1c07e4d638d110dfeff0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and compromised CMS upload links further supports a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://coretry.ru/uplcv?utm_term=how+long+are+cooked+chicken+drumsticks+good+for+in+the+fridge PDF link annotation
    • https://jhservice.net/imagenes/galeria/files/gofevisezi.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/94321712334.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///parupukoxenovi.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210903_085228.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/ef57e370535bfbba73edf20895afa4bf/wemanomirofir.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/pukatujubagegazalapifiwu.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/jofamuluxakutixuzezevexoj.pdfIn PDF document text
    • https://tanhaithanhvalves.com/quangcao/admin/file/rapokezewuse.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/sexoduwuwaxibesure.pdfIn PDF document text
    • http://live-net.it/file/gajux.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/66711219519.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/naletedifuluvap.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/70104645298.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/93275151739.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/10537108260.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d0fcca984---juwazeverifidazatufo.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109041133195305.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/7faa56619a1ce571d5a57ce6946409cd/52426880178.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/xowarosevajotimisa.pdfIn PDF document text
    • https://kaparatt.com/images/File/bavumovoki.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16140f4a0b30b4---jevuxevukazavimisunapeza.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/mojesesik.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/xukeram.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/wofarevoxorot.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/78966122745.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_off0000c6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D2 11192 bytes
SHA-256: 9bfac45863f945b21296fdb721de0b53e684976b36d2e3dfbb03f6133f44c086
font_01_sfnt_off0000e0a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A7 16528 bytes
SHA-256: f43f1642377dee317c1e1952dd762d3adfd99ea61019c300c55d0a7abd759ff9
font_02_sfnt_off00010a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.