Malicious PDF — malware analysis report

Static analysis result for SHA-256 88dace9b73e1164b…

MALICIOUS

PDF

88.4 KB Created: 2021-06-27 05:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 41aadff17cbdf138a04eb60d98985c47 SHA-1: 3f59fd8290f7eb69cfdb4b2b5182d12c0878564e SHA-256: 88dace9b73e1164bb65414f614d286631d0e4468c2ec7f5693b3011cd736a637
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. These links likely serve as redirects to phishing pages or malware download sites. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

Heuristics 6

  • 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 https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/oaj8r0ks7fmo43ku4l04qth33r/xulinupixuvigaten.pdf
    • https://haltia.mx/sii/ckfinder/userfiles/files/damakujurerofazigalolikis.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/qecbl8tmnvdlcu0g12mq6hhmkn/15514402494.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/tsdkhjm2pj3k91q4qbn6eb8cvt/39965352749.pdf
    • http://thepokeluau.com/uploads/files/vipezavejosisogu.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d6463ebd2cf---diloletaz.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/d38a91e7e8fb06d295cc6eb582574809/7578180757.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/5eb4af80ca58072a262fc23c2ec56998/96253661486.pdf
    • http://vladjurnalist.ru/archive/file/kirezetanefuwade.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd96f17828---91199733043.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/90edd3f6d6ce74aaf5fc0f7bf0fe71ea/zesinedew.pdf
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/12853922396.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/11ad0122cafd08823584f0cad18c918c/16087339458.pdf
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/kaxujugirufudabumofusoj.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ee7c1679f---gusokav.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/304141cd0816d75d73e69885156aae69/66875077963.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/912072d65c39282339bfd7b9ae212310/59622762393.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085020c89129---refupo.pdf
    • https://bleikss.com/userfiles/file/7918254659.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/dc3ba9067e8d470ceede3794d5c51833/2719962047.pdf
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c0d573cad---vamokunidorizuripevutofe.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/29cca59783f645ffae4b581032eb9fe9/getomenelekawevates.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbe1d4dc51---48171235085.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c58255f1b30---widoro.pdf
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/piligowozabezuxewapojiz.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16075159c82a72---pisapejita.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/d9uerhmg76ha2qo2h147l5qrk0/foxipinedorusarekewa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=shadow+of+the+colossus+ps4+3rd+colossus
    • 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_off0000f1ef.bin
b83aa46b96ef74b78505c7ad9b914907d1966450426e3db45ae42eb41c210f41		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EF 11032 bytes
font_01_sfnt_off00010be3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE3 16792 bytes
font_02_sfnt_off000123f5.bin
d664b40289f21c674f5d975cc87a510e2a24763e76642b9f7e4004158fe7bc96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123F5 18356 bytes

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