Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a3489c09a791fd…

MALICIOUS

PDF

77.9 KB Created: 2021-06-30 04:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 77d1aa87e791276c9cec477cc1d6e967 SHA-1: d033858f52d4cd69d3e506a1e7c64f64592ed1b1 SHA-256: 18a3489c09a791fd7982be750c88de20d7f00811b0eb5cc604c893d509104806
164 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm hosted on compromised WordPress sites, with one URL specifically pointing to a PDF file within a formcraft plugin upload directory. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further malware. The presence of a 'link farm' and 'compromised CMS upload link' heuristics, combined with the ML and AV detections, points to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5aa873b440---31354093226.pdf
    • http://creptiles.dk/userfiles/file/sakopuwatakeragewez.pdf
    • https://gastrotest.co/ckfinder/userfiles/files/wafabofafijifajanolapo.pdf
    • http://acecaalcoy.com/userfiles/file/rorisekenujusozavudoz.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ireer9jnihud59kan83ipenft1/34397018469.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb363753b17---vudukujim.pdf
    • http://poorclarescork.ie/images/69621845548.pdf
    • http://chatsworth72.com/clients/5/53/532ec3c8dc0e95779814939736d4df6d/File/vuruvopadisaxewalexomero.pdf
    • http://adabaskimerkezi.com/upload/file/88448456328.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/l0qr99p2i47t226fsa831dsevm/retikokusikazerorafere.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081767ddd722---fanoven.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dba5603e29c---70965665734.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/8881fe84f49c6871c3f37d051b66e175/68406447247.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/9mrs2kbn45e4sevq9gc68gp8k2/20274895957.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/a4110cb54fdf1f52e1720b65584e2c5b/viwupisoruk.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a592d38be21---76154634732.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b9ae32553---taxajeze.pdf
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/luzol.pdf
    • https://samsungdvmklima.com/upload/ckfinder/files/leladeneguj.pdf
    • http://www.hangmandigital.com/files/file/95867079635.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/0f57f15a8cc041f96add1ebff0fea7fa/7896658813.pdf
    • https://atcotourismtravel.com/userfiles/file/vasabunusawapida.pdf
    • http://intergeored.com/upload/File/47112683939.pdf
    • https://go2germany.ru/files/file/47997214750.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=fast+find+people
    • 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_off0000cf7a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7A 16792 bytes
font_01_sfnt_off0000e78c.bin
b2003f3c68a8b7acf99969dcb7e2a69aee3560da6b7a085ed002760194b0ad62
pdf-font-stream PDF embedded font (sfnt) at offset 0xE78C 16924 bytes
font_02_sfnt_off00011368.bin
ce407396860009c52128486857cb053ffcd53a06330dd980cef21ce9ed09d018
pdf-font-stream PDF embedded font (sfnt) at offset 0x11368 10368 bytes