Malicious PDF — malware analysis report

Static analysis result for SHA-256 2be7a46041e9bce0…

MALICIOUS

PDF

79.3 KB Created: 2021-09-03 11:27:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7b0432809b6b9998f77f446a77505686 SHA-1: 739db63866572232681764b94705e013140272c3 SHA-256: 2be7a46041e9bce0b07e038511b45eb61c85d505591bb3b884865b7b12bb4b1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/762f0b836406b8dd78024a2d80886be6/dinewokeren.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6da1ee6fa---sidotumolebazum.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c796a73ae6---nizuto.pdf
    • https://angelsstaff.com/uploads/file/5461817658.pdf
    • http://ccsup.co.th/uploads/ckfinder/files/vituka.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080e5d849607---dizafisusenavego.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a53899691---suduta.pdf
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/84507793775.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c749105b5a---vafubunofadugixalawaw.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/86f6f3d8edf923754f29d23e706a54f0/10336350905.pdf
    • http://ymmicro.com/files/files/81495892884.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11fa3374ec---topakixifufefiloxasezix.pdf
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/76433268036.pdf
    • http://viviapalermo.com/userfiles/files/zebazoxazot.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bbff9fc3a38---lemumifuvofofogomalajum.pdf
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/mrvs8djamc7dbajk4gco7h1hv7/lujuwigi.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cb842124e---kebimabirofilitife.pdf
    • http://animalscipublisher.com/files/upfiles/file/21686868601.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/e3326adb8c726bf1578661b954c3da09/20215483916.pdf
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/gunitomaralulanarezol.pdf
    • http://michianaorchidsociety.org/clients/2/28/2832e32407c795c8d28ffe68102aa18e/File/wozurowifulumufelavujubob.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=embryonic+development+of+frog+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_off0000cfbc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBC 16792 bytes
font_01_sfnt_off0000e7ce.bin
5fec4eecd85c2d6b5fa728b4f22a1767adb862f83ef6910453f363dc8085f8d3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CE 18252 bytes
font_02_sfnt_off00011720.bin
0172bb19c69bea95d39934d282ade4905bc2052af0eb5921a2d7ee9559cd035f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11720 10936 bytes