Malicious PDF — malware analysis report

Static analysis result for SHA-256 3183bd86bcbf4d75…

MALICIOUS

PDF

84.4 KB Created: 2021-09-21 05:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cb8ca790596f7732d0c8ed9696ea9d3c SHA-1: bc5a876340375ea467c6eae381b6f11120c72e75 SHA-256: 3183bd86bcbf4d7557d110bd4fb636fd641ce86969d11abbeb2768b981d57e95
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://crewmak.ru/uplcv?utm_term=voloco+for+android PDF link annotation
    • https://thefertilizerproductionline.com/d/files/noxuvuranuzani.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210921081324.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/92261664165.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/pegagokakisek.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/13450425728.pdfIn PDF document text
    • http://guchen.ru/d/files/8680872041.pdfIn PDF document text
    • http://shanghaicruiseparty.com/uploads/file/99994162471.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/40660463172.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/66437379635.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/dameliwunaf.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/rejenowaxez.pdfIn PDF document text
    • http://edallyshop.com/upload/files/nefaf.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/32766568187.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/96872130877.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/pujonosaw.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/64386166303.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/tinelifuduwilokatuf.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161416f02dedfa---77588655900.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132f8153ca8b---forikibem.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b58eea2bfa---16430670565.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/xenefogotiziwododip.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_off0000e8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C9 10040 bytes
SHA-256: 78cda5a22b8358f13a3517ca00e1990d31b7d2d016755629ee0a937321dd5806
font_01_sfnt_off0000ff1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1C 17348 bytes
SHA-256: b57fd7762281f2f326a6ffd48e55ceed4c88ab814ff3c7f86d1dc3e5b7d2d6a5
font_02_sfnt_off00012bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1