Malicious PDF — malware analysis report

Static analysis result for SHA-256 94a766b4b5758ef2…

MALICIOUS

PDF

85.0 KB Created: 2021-07-01 00:07:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fa2fe3ff6e58be27da211a97b1a6b8d3 SHA-1: 6b6ffd12fee2fbb12c8b78b4105b7d131fbb7b12 SHA-256: 94a766b4b5758ef23a8a1ab8cacb54a04e3b170204265cec2576afc8cf220329
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised CMS upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious sites via the link farm. The embedded JavaScript is a common technique for executing malicious code or initiating redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9834

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c73f4be28---girasetuf.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a353ad04f79---65663984044.pdf
    • http://mundori.com/js/ckfinder/userfiles/files/14969421101.pdf
    • http://cl-pub.com/files/files/kowudukixat.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/751812affe9b77dedd936466edcfcec2/kubaja.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d466154ab3e---zazijewijofazukesodaf.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb4bc140f1---vabefudifividu.pdf
    • http://crmloccitanecr.com/campannas/file/savebarites.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/c1b60bec6b24a5118b21f3c8daf9fb47/mumoledamuxeposelogomuviv.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/048e3df9a9cfd356ecbd5ccf9f24d0b0/zodigigemapepeno.pdf
    • http://reflita.lt/uploads/files/62759456321.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/43ceb6009354b2c350a6717ec4e3617a/56198161454.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e9e5cbb15---pamisazatifepobodepiw.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a42389a94b---42850769703.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f49ba1d71a---nutakodifa.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/tu9ob4bsgaifa2perehcg1bl33/lejudokaxixasogeboj.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ih8qkct804qj61r0m49v9r0lt3/91986495338.pdf
    • http://marinapogon.pl/upload/file/bapufoxiwigezopewalupu.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6af79b8fb---jakuxomosuboliwalerezuri.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/ceac2cc87512e9599413cd68fbdc9e58/xorixiv.pdf
    • https://fenixfalt.com/userfiles/file/vadukejukifavebupu.pdf
    • https://biovuspharma.net/userfiles/files/lojeruze.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/u77u1ifooenare5aeqouuh55to/sevolagiloxato.pdf
    • http://adveotec.com/img/file/vaterisujetiparek.pdf
    • https://5a.ro/ckfinder/userfiles/files/6052247080.pdf
    • http://aitrans.org/UploadFile/file/F1202106270503548200.pdf
    • http://narnivet.com/userfiles/files/fozaroxoj.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=nominative+and+accusative
    • 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_off0000e624.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE624 16792 bytes
font_01_sfnt_off0000fe36.bin
5279a9d2d3ee7ad823f1e9063855cbfec27940f101961442a4f9b33d61d605ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE36 17992 bytes
font_02_sfnt_off00012d28.bin
f86e6a86731e2c7f400eb4b5dab47ce8498ca35b24aadf15550359308457a724		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D28 10528 bytes

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