Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf771c5ef690c313…

MALICIOUS

PDF

110.0 KB Created: 2021-06-26 13:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 21dcafba0b2f560ca0189c10da39bdf1 SHA-1: b021b86f1b60b333fedaf6b6966773c7f081aeb6 SHA-256: cf771c5ef690c313cbb407a09bd88bbff90831c55dc2900c25e50164e5e33b71
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous URLs pointing to compromised WordPress upload directories and disposable hosting. These elements suggest the document is designed to redirect users to malicious sites, likely for phishing or to download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9819

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://peneleos.pl/userfiles/file/rategesetogisaxadofipoj.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d303b6d6a5d---wifunekelutalak.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9130ad821---50157948809.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/950afaa02d45387a960063138d3a10e0/worigumi.pdf
    • https://healthmatters.me/userfiles/file/38528716633.pdf
    • http://dkyangmei.com/uploadfile/file/2021062601593273499.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a915cb505---notuguseketebefab.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/00d9d00bdec6fae0793cfda5fd7d949a/81036304019.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4257a1dfb9---toturefenanenuje.pdf
    • http://elencostruzioni.it/userfiles/files/suwixekutixili.pdf
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816e3f516dd---wipaduladupabakibaniginus.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/20631ff9990585b330d8168cbd232788/polafekekigav.pdf
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/nowixitemaxowo.pdf
    • https://lawyerupsmart.com/tempimg/file/38190257517.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2ceb4e1b6---41499383849.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/zudafajupisiwiworeturefi.pdf
    • https://akproauto.com/nbloom/fckuploads/file/palomasuloradokilirobug.pdf
    • https://mudraconsultancy.com/uploads/files/xiwunejuseravepokibatip.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160812607a5f05---sugasejipotawajubemub.pdf
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/v2dfuoml69rofl5hoklusdbebg/89587030418.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/56e794152d92e78dc1c3a9fe4d789d52/41535921159.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1448d2304---13476568604.pdf
    • http://gernano.eu/gfx/userfiles/files/8022286290.pdf
    • http://blow-w124.com/js/upload/files/gijuvemidepofusetadegezo.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/ao4qiou02onti48i92mr34fsmn/tunagigeturutedoleb.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/ea1c1ef1423cb2bc1d7b9d539b4032f6/rimijesibonujafat.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=30+day+temporary+tag+nc+requirements
    • 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_off00014bdc.bin
f49e40b560ee80613a1133c48ea45899dea142e708b37d40b31480edf240c7e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x14BDC 11368 bytes
font_01_sfnt_off0001661a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1661A 16792 bytes
font_02_sfnt_off00017e2c.bin
764486b8b8427d8351828067af38945f22ed908ca89ffdbf69888287b33741ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x17E2C 17080 bytes