Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c5c6e7449f66db2…

MALICIOUS

PDF

78.2 KB Created: 2021-09-13 09:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 85c822e4b0ada0844831ceb9d8454052 SHA-1: 680499fc077952dad2034984ccad0452ea9e62d7 SHA-256: 8c5c6e7449f66db20498dda80e1b10262f399384629730c195794cecdb6956f7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URI heuristics point towards exploitation and potential delivery of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://balade-pierry.fr/userfiles/file/tezozifopobidopojup.pdf
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28110190262.pdf
    • http://chpcentre.com/files/file/vupotujenejefasonixopir.pdf
    • http://primebrokeragetx.com/ckfinder/userfiles/files/59252404125.pdf
    • http://mfcpavpos.ru/file/11264581186.pdf
    • https://glamweddingdesign.com/userfiles/file/56061406204.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16132f71b6cf05---kosopifusebexolug.pdf
    • http://thementalhealthadvocates.org/files/userfiles/file/bibarexoravorerozeze.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613585269c08b---83950719531.pdf
    • http://hrdiborice.cz/erucom1/files/files/mebozemataz.pdf
    • http://yarpb.ru/pic/userfile/bapekevisuwamika.pdf
    • https://inprovit.com/ckfinder/userfiles/files/21468956848.pdf
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/xekufazepiragedalowatuxe.pdf
    • https://mots.alaxarxa.cat/cmsimple/images/file/42405268209.pdf
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ginuzura.pdf
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/44857017677.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e32d27d885---nilemikebes.pdf
    • http://185.33.116.145/~acus01/upload/files/fozekomixizogamusem.pdf
    • http://www.naraihillgolf.com/admin/userfiles/file/novobigemetiriratif.pdf
    • http://evaemlak.com/userfiles/file///rasasitevodojenefa.pdf
    • https://nestsearch.in/admin/uploads/file/21880931679.pdf
    • http://omeofest.eu/userfiles/files/xafalibemi.pdf
    • https://0a3exp.com/upfiles/editor/files/41296178896.pdf
    • http://csc0535.com/userfiles/file/20210906134554_8n60dt.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=asphalt+8+apk+hack
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf18.bin
bd742ae3613bb6fa5d84d13e5dd958fad7f3331d446ce435e38b105e6eaa1286
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF18 10204 bytes
font_01_sfnt_off0000e63e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE63E 16792 bytes
font_02_sfnt_off0000fe50.bin
3d52d7d25fe90d5af8e6e883d95d60b215ae69b182596078c2b53facc612bdc7
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE50 17364 bytes