Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbbfd66b70ac81b6…

MALICIOUS

PDF

85.5 KB Created: 2021-09-21 01:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 518a03a72a4221dd43261c91f8864e3f SHA-1: 6fcff18281347ea48ab2e417f6431ced1cc2077e SHA-256: bbbfd66b70ac81b656030f92e98b49e3dc6b761659486323e5b51dc1036b09de
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised CMS platforms, suggesting a link farm designed to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pistant.ru/uplcv?utm_term=how+to+download+tutuapp+android PDF link annotation
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/4ed379818d2f98b01a0ebed335748843/14504963233.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/29146779298.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/fovuvemuloxoti.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161314ec8d97c0---91647754032.pdfIn PDF document text
    • http://ducnhua.com/upload/files/jadizudipotasimoviraref.pdfIn PDF document text
    • https://kokomanis.com/contents/files/10077837633.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/digijisasabo.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/zugipifegifuk.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/ginunamolosud.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/10312600694.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/mipasa.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/96181455439.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/60631482814.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/32571267284.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/robow.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/23397188964.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16149082cd4601---56742819136.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/25243243153.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/5109287455.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/89463405870.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/lutez.pdfIn PDF document text
    • 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_off0000eb5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5C 10264 bytes
SHA-256: 030e99d9227389011189a7ba0154cfeb58b68e8fb657a34d853870b211f31cfc
font_01_sfnt_off00010275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10275 17688 bytes
SHA-256: d99fd0bba4d0152ddcd7bb62f47838af46c283697edf15d17a4c48d1accfa70a
font_02_sfnt_off00012ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1