Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b6ff2cdba9e5eb…

MALICIOUS

PDF

77.6 KB Created: 2021-09-02 19:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0ad5aac71565f30df6d653f0a59a7d0b SHA-1: 063ea80e1995714efeebd5df48a12aa2986d559a SHA-256: 85b6ff2cdba9e5ebbb39397378dbb18234db52b9c6374dc37347597e00baa430
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or appear to be disposable. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. The document body is heavily obfuscated, preventing a clear understanding of its direct lure, but the overall structure and URL analysis suggest it functions as a link farm to distribute malicious content or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://newtop-eg.com/userfiles/file/32886691417.pdf In PDF document text
    • http://skiflogistics.ru/userfiles/file/zalewu.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e75b3a3662---purineferu.pdfIn PDF document text
    • https://bamor.org/userfiles/file/wevararivi.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/wuzatibakigi.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/kometugalobunojan.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/83e42c0b23891bfd870277266c33e2ca/58495515284.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16113bce350dad---dosofogotizukuf.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/miwevi.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/kifezolafosoranalozuze.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f1b69b89e---51079212556.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/68640830822.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/94216262914.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210810074907.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e6adc70cd---musin.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/79800e7ec5c24e54112849570353fbca/xifis.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f19cdee9c3---vazupedijuw.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16081d9b7c3fd7---boruresojipimomuvo.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/jirae2cgnf8f85hka0hdr4pvpo/25415976259.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c4c902096---zenos.pdfIn PDF document text
    • https://questyme.com/userfiles/file/nazimimenaburexasib.pdfIn PDF document text
    • https://eitmedu.in/ckfinder/userfiles/files/lazemezuwoliwibijiri.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6e6f39351---lulusijepimak.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/3f4599840bd1a526e443ed995865281d/kexiberokukofuku.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160974f0ba346d---25913177166.pdfIn PDF document text
    • http://farashimirooz.com/files/13216326217.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=wilmington+nc+map+pdfPDF 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_off0000cb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0E 17856 bytes
SHA-256: 55b1dbbe2977d4a7afb128fc5914ed9dd38bb535e358a5a68b1b2117c3a9c3c3
font_01_sfnt_off0000f924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF924 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001113b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113B 10556 bytes
SHA-256: c05590214ed642c09584d3b0027193ced9eb49b30e38d8024d6511a0e9fb9fab

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