Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1f645c656fbbe3d…

MALICIOUS

PDF

84.2 KB Created: 2021-09-01 16:24:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a6b3201be7ccab7fe9a4cfcbf796be76 SHA-1: 31f8258c2efd0d5e8922c1d35cc3b46eae30c43f SHA-256: d1f645c656fbbe3dc2d23dfeb4740e68cd5597fba2795288f0346dc79378ca48
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detection and ML classification strongly suggest this PDF is a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://agendatourvietnam.com/hinhanh/file/lolupakuwegofebu.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/1b45a4i1daahvkii54ug35bv0n/58326201137.pdf
    • https://indobaliart.com/sitefiles/file/57972099438.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607866ee4476a---16029503243.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9b6d15af0---12616542123.pdf
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/lejiw.pdf
    • http://dalaichau.com/files/povudeva.pdf
    • http://alnoorcity.com/userfiles/file/71456864574.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/7md0q0nlsokqdtij1b7ed2tn4f/sejiramolodaf.pdf
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/085149a43f3dfb9fb68a016277a54642/pogajajubite.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918491d80f5---49324719174.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d241416fa---63295260253.pdf
    • http://ondrejkocar.cz/img/file/57122913768.pdf
    • http://stylekd.ru/files/bojobujiselu.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/ebhrho1ib0eshl8f7og5e5vuf6/923107493.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/68356657441.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/csnsv894sncgsje9krbcek3n2c/32485800482.pdf
    • http://derkwoo.com/upload/editor/files/59446277584.pdf
    • http://marsalanoleggio.it/userfiles/files/73869065014.pdf
    • http://jnnycc.org/userfiles/file/84283207287.pdf
    • https://andhimazhai.com/images/files/buluwaraxawiwubuxeba.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102ee7c8ff78---72124537253.pdf
    • http://ipublicity.cz/data/file/jetolivejowadubupurap.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5b52ba460---vimekaka.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/c6c961a15ef42c6573798c325f5467d6/61973453247.pdf
    • http://gz-chengeng.com/uploadfile/files/sirupemedobejasageg.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=data+analyst+introduction
    • 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_off0000e43e.bin
76fa0ee6167b2110bbf938a92b06e1d00a0cebadfe542f81d5d53fa5207b1d36
pdf-font-stream PDF embedded font (sfnt) at offset 0xE43E 10444 bytes
font_01_sfnt_off0000fc1c.bin
cf4cb78e8fce1e9dc9488ac2904939d17341ed2e8139310b6e7f40a5ba096815
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1C 18224 bytes
font_02_sfnt_off00012b26.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B26 16792 bytes