Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0894031af0955a7…

MALICIOUS

PDF

69.4 KB Created: 2021-09-25 07:25:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d3d5497362ccf2b31f8a34d52da6f2e8 SHA-1: 81c28dcd036044a1d751f1db3242817f5f454828 SHA-256: c0894031af0955a7478b18229d7f34efdd5e3cc41e68509592c171de1de268a5
184 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded URLs, many pointing to compromised websites or disposable hosting, forming a link farm. The presence of embedded JavaScript and heuristics indicating an image-only lure with an action trigger suggest that the document is designed to trick the user into clicking these links, likely leading to a phishing page or the download of a second-stage payload. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://diversecityuk.com/userfiles/file/boserefepaxibewiki.pdf
    • https://llibreriaha.com/img/events/file/94739851348.pdf
    • http://atem.sciara.eu/public/upload/file/risedezaxerolej.pdf
    • http://botosani.ro/img/uploads/file/65165284866.pdf
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/kimobanaveva.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1b5b0694c---doniterok.pdf
    • http://lamorenj.com/userfiles/file/42199956131.pdf
    • http://mega.kz/media/upload/files/limedobuzijonazumi.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142ac35372c3---24336388177.pdf
    • https://greenlandpark.com/uploads/files/wigejawojisiz.pdf
    • http://vetsnab32.ru/userfiles/file/xazufobi.pdf
    • http://hyosangjo.com/userfiles/file/20210903202421.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d07bc37b63---tofawolisaga.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613fca20076a8---46328198100.pdf
    • http://gtlmarinefuel.com/userfiles/file/putaxovizog.pdf
    • https://saikekanglun.com/filespath/files/20210907015857.pdf
    • https://beautydent.hu/editor_up/piduvezezirogodovubugawi.pdf
    • http://nuovartea.eu/userfiles/files/58795524980.pdf
    • http://dailymaytrogiang.com/userfiles/files/muwir.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614ce573b5018---fomamabusunixev.pdf
    • https://octvads.site/js/ckfinder/userfiles/files/runepasetigedimebunaba.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/welojamelujawadofuxigekim.pdf
    • https://livermore.com/wysiwygfiles/file/79606338963.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=avira+antivirus+security+pro+apk+download
    • http://s250801404.onlinehome.fr/img/uploaded/file/87912206553.pdf
    • 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_off0000b369.bin
506966919e772d9d61f5369ad986f652c3855e8ef46943fa82bd4e9fdec77937
pdf-font-stream PDF embedded font (sfnt) at offset 0xB369 13824 bytes
font_01_sfnt_off0000d58e.bin
aef460a211bde15bb91e6113b69fa7d6de4914af711008d419b73357ae70174f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD58E 10948 bytes
font_02_sfnt_off0000ef36.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF36 16792 bytes