Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d095dab22110953…

MALICIOUS

PDF

82.3 KB Created: 2021-09-18 08:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 10a44e7e2aa5d068f4b1da7465ac4c4d SHA-1: f07f41b73b826ee6f816305ac2be52c6898bedda SHA-256: 8d095dab2211095366615be2a8dfdfb214a48a1ae2dedfb1579a9735c9fb4a09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm hosted on multiple compromised websites, directing users to download further files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to exploit users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://myshiou.com/uploads/files/202109040106349186.pdf In PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/4465201152.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d933db05a---28469551124.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/tenekagefatuxux.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/rugujufevum.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/zaluragadilikumema.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/vesotopodipajero.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/8600758243.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb326dbaff---jugibepu.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/bosokat.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302f3d03a68---tiwatagemewanola.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/lufodetodufemaxefeboma.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210901191329.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210918063002.pdfIn PDF document text
    • http://123dvere.sk/files/file/22793009965.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/79368456493.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/nexefusukodalesiba.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/39161143282.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/33953431201.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/82lng6c54p4vktuv8u7paji374/gisij.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/a07e7f5e9d66731d39ba9afecf3ddd4a/31072246690.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109010914269307.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/e3067f5434e29a092fd72ca6cd0a6ab0/lememosizu.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/26809532996.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=get+apk+react+nativePDF 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_off0000da42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA42 10228 bytes
SHA-256: ab8badd960db5027025064944adb8f12797be572704a9528cbafd7e2da58d5d2
font_01_sfnt_off0000f164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF164 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10976 19324 bytes
SHA-256: 3cc6e621abad1436b0dba30c24833c0dc0d18065114fb2980d744f45cb7343aa

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