Malicious PDF — malware analysis report

Static analysis result for SHA-256 c699776d9317d4fd…

MALICIOUS

PDF

84.0 KB Created: 2021-09-23 03:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0edb91a785b81300a982f50f6143f9a4 SHA-1: 65c93d9bdf6f861bd8422edfc1a472ea967d02f4 SHA-256: c699776d9317d4fd3b2d3ab8a3d59e8d7b07ba02093d2c7de58d7b280f762a0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://guowangcable.com/d/files/10028122534.pdf In PDF document text
    • https://cuacuonbentre.com/upload/files/28664779211.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/gusakababubovuno.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/nodebesel.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/41653895117.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021091202101890881.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210901180414.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/38197279929.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614203e11fe19---tilumabupuridoxeviwav.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/99e62af04d999b6fd7cbf603e18ee406/70560297386.pdfIn PDF document text
    • https://visualarchive.bg/files/22163236138.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613777f737920---17730565967.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/jazefitifulix.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16132d54db34cc---84004655810.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/69089918448.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/65191698314.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/59841068063.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/revudeloruzeb.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/xajuziregapi.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/wokimapugozakapon.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/20235788283.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=dual+screen+in+androidPDF 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_off0000e425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE425 18332 bytes
SHA-256: 5bf339e163399a496df9c952eec1e615b08fd8929647db40169d0379550da6c8
font_01_sfnt_off0001136c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136C 10368 bytes
SHA-256: e21e03b37e6dc1f949e9c5c8236504e37649bae3aef440c4f5d102c8189ab0b0
font_02_sfnt_off00012aea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1