Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0bc5af7841388b0…

MALICIOUS

PDF

95.8 KB Created: 2021-08-02 09:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e9eb55976418a92f1b256942a8b0fe00 SHA-1: 8955d78d7741d26eef618373da6d0fff5f75e6d1 SHA-256: a0bc5af7841388b06c4c821c776563162b691698849f6be813d1dfd577e22437
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm for SEO manipulation or malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://sk-massimo.com/js/upload/files/regewutemuxosu.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f55585ba19---19415916621.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d39de12bdd1---busemevutufarixowig.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c73c431b09b---41004553425.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c302ae502e6d0ef783b0e0a7730667ff/46193954651.pdf
    • http://sobinco.cz/ckfinder/userfiles/files/lelewegixovopewobujota.pdf
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/87bc802f477a12fa9c708728e6d79794/15332629326.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/aaa65a90233fbcaf0d49e30dbb8a4d70/xawiwatatu.pdf
    • http://coreaad.com/DreamDataUpload/file/330585194.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9d581d2b8---fuxupetimuxewovaku.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/7b06c5b68d56dd877df4e9f0dd5f398d/84811675671.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/965ced87326d317398985b26e71147d5/nitesujexogunowibusojob.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607929d62fc30---boriluvazukowejasaxodok.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/ae67dd23af0ee15e03f41f53cb957def/ferutikinasujorikerozesat.pdf
    • http://realloans.com/clients/73966/File/xudufosoperepuse.pdf
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/60499883241.pdf
    • https://flexi-cms.com/uploads/file/dafibugotitilev.pdf
    • http://bright-inter.com/file_media/file_image/file/darodumuzowugob.pdf
    • http://asea-admin.com/_userfiles/file/20210629090024.pdf
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/nebupifozofak.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9a4ec7079---zejeradunelixalufinajelu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+download+images+using+python
    • 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_off00010f58.bin
f900bcc775b5e4e78e21e154b90b5ac4dc20945ece550a63f20d5394e82e9fc8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F58 11028 bytes
font_01_sfnt_off0001289e.bin
c0c66b4d1733e7aded53894764a54583d372e3e3d7ac8998f9da0aeeb0128f3f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1289E 18380 bytes
font_02_sfnt_off0001594b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1594B 16792 bytes