Malicious PDF — malware analysis report

Static analysis result for SHA-256 46a99a8a8faf917c…

MALICIOUS

PDF

90.4 KB Created: 2021-09-06 16:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ebc577cb2a20df0b33db403bddc830f5 SHA-1: 00390cf9443c99dd2985eb7b7240f318e46cf3e4 SHA-256: 46a99a8a8faf917cc96eb7a55998aae8f7bbaddc0f805cf2d0c338bf21276fbf
156 Risk Score

Malware Insights

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

The PDF contains numerous links to various websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm for SEO poisoning or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the document structure and embedded URLs point towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://architettotoma.it/userfiles/files/rexowe.pdf In PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5d5adbdf4---70412311783.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/b35d625ae75d6e3261b13471fb190275/getuvaseb.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/roxanomonudodipulebusoju.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/ef04232621598bfd12e65ebff6a79590/keniperokabiwobivanu.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/zebafogefeda.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16099af34c1874---xavizegepanisupukalodi.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/lamideniviv.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/1d136abc0a2da4223056ee9e9f5bca2c/93286553900.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/40524270342.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/11225937a89f68c10cbfb77981d22c91/45431973059.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/pigozanekovadupusenaxusew.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/72869358488.pdfIn PDF document text
    • http://chichen.asia/ckfinder/userfiles/files/73237185627.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6d69c4208---4322147242.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/siwil.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/a2ab3f60fbbf9b5d71c895585995d4e3/nonaladixejefatomegiwiveb.pdfIn PDF document text
    • http://artospace.com/pics/file/68993541565.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/lidutojipadosuwefave.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/luxevugezawejesubujijefu.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/88225038267.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/domuxobul.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/3818f52d6552558543b1f848c3021dbe/37717826816.pdfIn PDF document text
    • http://leguido.net/files/78036630048.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e7cea46f3---48308142305.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=ikea+galant+cabinet+manualPDF 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/xIn 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_off0000fcdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDD 18204 bytes
SHA-256: 0f07a2e277d4df5c6b53286f791d140a41f61694f2aa6c6941889552191b7c20
font_01_sfnt_off00012cd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000144e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144E7 10468 bytes
SHA-256: 6f5ba043a84c6414e2d8e457ea31189d93d3c433b6beea8a826defd8b7f8a023

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