Malicious PDF — malware analysis report

Static analysis result for SHA-256 396073b3d8569a55…

MALICIOUS

PDF

115.4 KB Created: 2021-07-05 05:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 356199c69566b4b942c3a637f859e2d5 SHA-1: 2258807062bba98cc3770136a040ac7203c7fbc1 SHA-256: 396073b3d8569a551a09d08f3e3d952b0a67cec953564e3d93ad5206a933c19e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF sample was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution attempt. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories and disposable hosting, likely to redirect users to malicious content. No scripts were extracted, but the presence of multiple compromised and suspicious URLs strongly suggests a malicious intent to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9703

Heuristics 6

  • 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.
  • 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://amandatravel.com/userfiles/file/japaroratovapesoxep.pdf In PDF document text
    • http://kaies.cn/upfiles/file/tutufijiwalonoji.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609484c26f6bc---29743997109.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608043478b989---wetodefevuvokubitafudena.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/866d1f12b8efa90506a0abe91913eb4b/31432603385.pdfIn PDF document text
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/16469533375.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/demazebigaxapogebomo.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/lelisofozedubab.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b09670cf1a4---tizose.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/760d865a92920a5fb08d8d1f3cd16680/54229199047.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/eff07755c905a9ef9ed58328c2a1bbf9/wekimusitijegofisizuzuv.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1d8eb9cda---84315178028.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/2479030079.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/zogulajesonozasite.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/18914931252.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/6ee7a4a3bbb4b4005cf08a0e907bc5f2/47685636338.pdfIn PDF document text
    • http://yongqingtech.com/d/files/lolavedajivobejozevifi.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/38045266796.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/liwotavedulaniwapu.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/073768c3abec8c20296515681e123a8b/33997370185.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0274273e0---filesulasod.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada91086903---ziwemimoga.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/48835545e89e3311f5c81e429241b656/kezawimarod.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/5f711d53b5ab31997a32c16864f16f91/xodatoxitikidis.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/c19f26605b5cede7053e5f69854d1cca/vufivotetuvixuzofupadijep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=is+like+a+long+or+short+vowelPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001146f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146F 6628 bytes
SHA-256: e528ba4cfa613a4344dd3cddfadfc347deb8980b3ee16afab84fbe00f09af643
font_01_sfnt_off00012bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD7 10580 bytes
SHA-256: 5f1f4050a0e9c7ba02bf843f01dc88122282fea25692df0bf2e740be2e86b124
font_02_sfnt_off000143fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143FA 29800 bytes
SHA-256: 9aa1e9fb436e9bc15f82bc0626c6b6e7dd1d7ca43a69b909b205dbf293060a7f
font_03_sfnt_off00018fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FC4 16544 bytes
SHA-256: ecb6d4fd825ef07e9b532c5d35f75aefa54a961a965e81ff77057b86e0507170
font_04_sfnt_off0001a701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A701 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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