Malicious PDF — malware analysis report

Static analysis result for SHA-256 3da6622b67f941d0…

MALICIOUS

PDF

88.0 KB Created: 2021-07-13 22:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 531c5e0e03bb7def40abf6ca1a343f05 SHA-1: 6ea66abf99a42108288cdee46cb155b37d81222b SHA-256: 3da6622b67f941d07e97616c566f5213bcebdfb39a059884267352e08237e1f2
196 Risk Score

Malware Insights

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

The sample is a PDF document that employs social engineering tactics, specifically a 'Browser extension / update installation lure', to trick users into installing malicious software. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to compromised sites that likely host further malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2a77cba24---jipebekorasesidadeju.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b6ea218bd---60638837613.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/jugusejosowigutinuj.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16080373ce89e3---dubezepokosatedejetizeka.pdfIn PDF document text
    • https://estoniapools.com/contents//files/wedajikiselivatarupumobi.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/37070334786.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889fb023e8a---waver.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6ca00c4cf---muminitevunowikiroxotuse.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/86lpqte8rghpndcld4cjtq4127/39359604462.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/303o5sct4ja0e2amfff8i0bl0u/lazadikukimasifitilupefo.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/0948dc4c7724037d1853ae137b7c23da/ratafufojabujamafugif.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/ne76rotnl7683qh1rkl1cnic85/77706356500.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/60859284385.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a8349ba19c2---vadakuxinul.pdfIn PDF document text
    • https://ckmandarin.com/uploads/xubaju.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bed57a0abff---fozozuzekejutelimin.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/18b84571e49f6be1d51771a1963f394a/paruvaxifururovimuson.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c656f23d778---26040294239.pdfIn PDF document text
    • http://resheto.ru/users_images//fck/file/numitezepapegexox.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e2df24912---54266394920.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608460040678e---rifez.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d313ff739fa---4790063468.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/diwolixikuvuluze.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/98162668456.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/lakejujumetavilas.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081703f4819f---tidilifuzolejaku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=despicable+me+2+free+downloadPDF 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_off0000f44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44A 11028 bytes
SHA-256: b01ac0e4453ea448ad6c7c558867c7fc1cdc57230d2db35aaf43bf785edd9361
font_01_sfnt_off00010dcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCD 17208 bytes
SHA-256: d9a432c7dcf6e3afeaf9327d8aa76f47d877f974542c362242608762ecfb35ff
font_02_sfnt_off00013a95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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