Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a71716cf8c057e…

MALICIOUS

PDF

90.0 KB Created: 2021-07-03 06:41:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7b03f3e8953ec12746096e87b40621c5 SHA-1: 6174fa834d100f41ab9e84fda6fa8c9d351db86d SHA-256: 18a71716cf8c057ef2c8f9d4c294c0602c951e0715af3f138f0110b3b7139584
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to external PDFs hosted on compromised websites or disposable domains. These links are likely intended to trick the user into downloading a second-stage malicious document, such as a phishing page or malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://wang023spa.com/userfiles/202106file/2021061112582870554.pdf In PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/c0f798020489ed1d252fd2f5e43c2a2b/risimufopuvixiritosulaju.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608099d4b6e0b---14572830500.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/ef87264d8046cb813d96ef9f5c0bedc0/12156760979.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6eb22d709---bewedi.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/402fd13318cc478ff192553526ad9fc8/35898673900.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/92227910271.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/mugekewisapakodudifunif.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/bccc197ad1bac43b6d6df7d31e0f9087/podas.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/19624792455.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6fc649a3c---99568135396.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/pbl279nvf57i5sppcmf59cttgr/97276197961.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3fcea8b117---piwuzozuwomarosok.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/u9dpdrumcu0vul6t1behedvev1/71982711716.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/firorudegijagarekuj.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608df4879c31e---paledevujiwoxexa.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/marisaxe.pdfIn PDF document text
    • http://4bx.pl/public/file/movotekafoveja.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/78652935228.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072d3537c328---65500507967.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f187590a5---xewokavoxuxokudid.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/a1ff4bdf6d78aacce0535f15d6cd59d3/48182126641.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/6d353dfa5f75346d77ee215423ded48e/60190211517.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/safedowet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=curzon+on+demandPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFA 18164 bytes
SHA-256: 136b41b8ff517a5cc6b0756dd40d05ee010f3ea5271dc69b8adb7dfda6b5c8e0
font_01_sfnt_off00012c34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C34 10196 bytes
SHA-256: 7fe5ff2baa1a10fd326bdf1c86d15140009a4b04b641bb99b074a7020270e4cc
font_02_sfnt_off0001430a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1430A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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