Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fe884d3f56a51fe…

MALICIOUS

PDF

70.3 KB Created: 2021-09-24 22:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8d897fcdc8d94b9438c82853e6e989cf SHA-1: d9219b3ca7ceb220a856c13cbf3dbe54ba7934f2 SHA-256: 8fe884d3f56a51fe6d6f9cf5ad1c4e4f485dcdfa3e6a6439ded0f0a71fa93ad1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.colline-eternelle.com/ckfinder/userfiles/files/xevalagiretefozide.pdf In PDF document text
    • http://willajarmar.pl/userfiles/file/jefixewopobuzuwemok.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/29643676995.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/83541261244.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/wopasad.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/37186143060.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161352a6bc7c49---rogalajutadagutegotonide.pdfIn PDF document text
    • https://dafelia.com/files/44613534048.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/37345866956.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/nowobusifuwuzake.pdfIn PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/xotowixezafujabosukov.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f27de2e3bc---lugav.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/64071623775.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/gedoxavo.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/67926190637.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/lofosujazod.pdfIn PDF document text
    • http://biosite.ru/images/news/file/4026664106.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16135d6bade742---44713550287.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/bobofabovirilororisubeb.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/4092884267.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/wirolalovarenuwuwapudilaw.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/9alprfk3b18352000ujng3kgpp/fepijoduwef.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613905f4410e0---43852959210.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/40735574686.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=mustang+gt+pricePDF 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_off0000b3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3CC 10476 bytes
SHA-256: 8b1907e55a32bbe4018c104cf123c592d94d35c844de9742dafcc52e94e55f8c
font_01_sfnt_off0000cbc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC3 15660 bytes
SHA-256: e0ccc124fb8166b5b851bba0dc55a596eafbb136107e190abaf71e273b095c3d
font_02_sfnt_off0000f3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1