Malicious PDF — malware analysis report

Static analysis result for SHA-256 496c0985c777aac7…

MALICIOUS

PDF

88.9 KB Created: 2021-07-03 21:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f59bf95ff24f0419d4e3460bd7a3445c SHA-1: 17b816f1f873bffdc714bef30e4d8099f3a9d2f2 SHA-256: 496c0985c777aac7be9adc5e063de547d5697207d632622f2aecfbeea9783bac
236 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier. Heuristics indicate it uses a 'browser extension/update installation lure' and a 'password-protected archive lure', suggesting a social engineering attack to prompt user action. The embedded URLs point to potentially compromised WordPress sites, likely hosting further malicious content or acting as download locations.

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c17f6194493---18320007202.pdf In PDF document text
    • http://washburnhs64.com/clients/f/f7/f75dc469904bb25755ea64d7551c4a95/File/70206529737.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d9b12eb2b2a---22795257142.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/nifixaj.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/fafovijugonefevak.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/noranupukixisevovagimulo.pdfIn PDF document text
    • http://thepdaitruongphat.com/upload/ck/files/7924206582.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/a0d4028a276f95c1626aa4d0993d6d29/jiganipigovizuluri.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/52fa66cd82e167bec17f6fc01879f32a/minekusivetaluwutoj.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/vu0lptl5r8qbsoh8kftbk0aar5/23612555486.pdfIn PDF document text
    • http://51-lq.com/userfiles/file///guzafaboxomupenosox.pdfIn PDF document text
    • https://mauspro.net/upload/files/89203155702.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780108bd282---xoxugabekujowinidanotud.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/0fc6d8ef615602d57917795b69f18aee/vupuruxenam.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a12039e296c---95057534885.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/9c4f874cbd81ef0a871bf6464b82eb20/84818890426.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/1it93mlbn1r67ld87u0k8t7tca/vigejijuvit.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/88026101081.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/dde8efcf55e7541f8b655dfc7ffbf59f/nexovawuzurenaxupogexe.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/femekepel.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/5c911ff9027e65b8e743ccd863630bd1/raxedupa.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/543e5c7739b54d699174518f947bead6/jafamadolopubosifomuwan.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/8hd39u2acnobq72tc6jb3ubj3a/lavazujupugatiwaduzufuzef.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/bururesofufobokuxikedur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+do+you+create+a+password+protected+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF876 10664 bytes
SHA-256: 9f5268b5f98746d2851824ac95083f4901f36365caa5d5075fdbeeed0fb5bf2d
font_01_sfnt_off00011118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11118 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001292a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292A 17244 bytes
SHA-256: 3e846ddf22ffaae918ed2cd08a44b594dbde2d4f31daff8484b43e2c8322f440

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