Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bf184dce751d29d…

MALICIOUS

PDF

87.0 KB Created: 2021-09-01 14:24:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 970a6637a211bfa23bd990e21a83d38c SHA-1: be00373b338ca4dc4a0e4d67274339f5f066af46 SHA-256: 3bf184dce751d29d2fc70712b8100aca53b3c21c224516e0f2f812b27380a1f2
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to external resources, some of which are hosted on compromised WordPress sites. The presence of these links suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://fujiya-la.com/uploads/files/sezituboxubolajine.pdf In PDF document text
    • http://coming-c.com/userfiles/file/24034421278.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/savemosateva.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1ffcc63c7---numapedarokula.pdfIn PDF document text
    • http://alkanboya.com/files/file///gebesokefediguwimadodimab.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/fiwukajuwojunawes.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/nofumobesenuvupazufu.pdfIn PDF document text
    • http://d-innovation.com/upload/files/46740422515.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b46c5fbbd76---59398778286.pdfIn PDF document text
    • https://hssanesteban.cl/files/barokawebufujukam.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210830142159.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/295ed3193ba4afbe64d8d25df3e45836/dufubepitin.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/kopuzuferivawimezaraju.pdfIn PDF document text
    • http://ccsl.asia/files/tawofopejewixugu.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/bokazamufabepemokibubeta.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/zawesuwadirelaretiwa.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c36ec7020---49816928627.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/38431466676.pdfIn PDF document text
    • http://sheeld.org/clients/d/d0/d021426cee8527c21a172be12ef3d645/File/gapoberagepotawomizesi.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/57715945329.pdfIn PDF document text
    • http://matras-devison.com/upload/file/82131789951.pdfIn PDF document text
    • http://ruegen-ferienhaus-schneider.de/userfiles/file/tutimarojesabezumum.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077be8e9ac2b---zikadefojatuxavotup.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/97466193711.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=phonetic+symbols+with+examples+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_off0000e473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE473 21240 bytes
SHA-256: 973d8852f927b9752f83349009de50f6a514acdcd322d543ec304fba35d2b48b
font_01_sfnt_off00011b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6B 11228 bytes
SHA-256: d67a869efb46489958ee995c3c653174f1d8e0c7bf4a93b65a8460556274eaa3
font_02_sfnt_off00013575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13575 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1