Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a0037dab24c02a…

MALICIOUS

PDF

79.8 KB Created: 2021-07-07 07:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7bb00dedeebdab1802533a77a3c21636 SHA-1: 71521651d603c299eeba6a07f4db5267ba047644 SHA-256: c8a0037dab24c02aa508bfba11f368af5f55f459f62481e295998b0128ee85cd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress upload directories or are hosted on disposable domains, suggesting a link farm designed to redirect users. The primary purpose appears to be directing users to malicious content via these links, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://iphonerepairservice.nl/app/webroot/files/userfiles/files/39351447037.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/6e93024ca78c3c95de4481a24b44d906/defomevuzijaz.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/5e1b524d9c108b1ad36203c261291aaa/34701486706.pdf
    • https://digireg.se/upload/tumufadarud.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1607852f84f92f---67578684040.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a589a08eeb2---pikumog.pdf
    • http://alexlunacoach.com/img/editor/file/31461166039.pdf
    • https://sherwoodchamber.org/ckfinder/userfiles/files/gibedoj.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/kutavafe.pdf
    • https://sonntag-immobilien.lu/userfiles/files/80881001174.pdf
    • https://aulacvn.com/upload/fck/file/87311176163.pdf
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/56808674589.pdf
    • http://archpiudue.com/userfiles/files/linovosibojojozoliwabuza.pdf
    • http://lawrence-spruill.com/clients/42275/File/56897843225.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8df6ab3277---55355934960.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/vprni8kvuh37i20hommfpp3sh7/binobelonatowubopu.pdf
    • http://grandrosso.com/js/upload/files/6650682659.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/7e131bb78d30a57ba47fd36b0c581314/nasejurulusotupoj.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608361b00c028---97217755917.pdf
    • http://tragiaocolamsapa.com/userfiles/image/file/nikewoxizeravasajibubiz.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/7f6dea39c18a3a25b7a88784fe1b3a4d/96135122483.pdf
    • http://vds-construct.pl/userfiles/file/26133414127.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/638b592c47ba11d8bb2321ac28c2eee3/86506890228.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfcb2410a6---57899891446.pdf
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/241564228f57ccd1e8d81062e5bd31e6/45461737599.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc910053d4---55902290657.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=rlc+circuit+phase+difference
    • 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_off0000d4f8.bin
4f1acc082201e24e1b8e9f1ccdb392a51bae237f400aae7c946d22fb335ceeac
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F8 16848 bytes
font_01_sfnt_off000100fa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x100FA 16792 bytes
font_02_sfnt_off00011911.bin
514c8402942a94def19212fbad37e378978b40401d31d97190f10903a56ea980
pdf-font-stream PDF embedded font (sfnt) at offset 0x11911 10740 bytes