Malicious PDF — malware analysis report

Static analysis result for SHA-256 0700b3b7caf24790…

MALICIOUS

PDF

77.9 KB Created: 2021-07-04 00:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 195a77d80aa0501b1f943c69062bd759 SHA-1: 47156f595a3a41c5f473aa71564c8f9790057b9c SHA-256: 0700b3b7caf24790e54d44d76b965c68669e1e4b88f935ce2a6bd9930b3da09b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a large number of links, many of which point to compromised WordPress sites. This structure is indicative of a link farm designed to distribute malicious content or phishing lures. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the presence of numerous external URIs suggests a redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/e3c487cc041106576d806e9343841db2/fabovowedekogetudadur.pdf In PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c65571f6c---wezomizusoluzinologabakuk.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/19124281559.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a19775805b3---22682555613.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608588dd59204---bafexusebesaf.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/21088187612.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607898c425126---zatojavijijofe.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/d4b37f00b38a4f435264faff5ff6b579/69975536358.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a6c1cd597a0a400de472faff52da28f9/50892653877.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/193199290260b8a99c565a1.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/08a861c9da5811eb621fa3c217635b0d/zidemejulapurupesiril.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/jl8fjplfm6u08263ec0e4vj3f2/64949735097.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/1d59b085bd76e4c9c566a8d62baa1ae7/pofipofip.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/tipetipi.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/5sq32oejgq7cgdok50r1mgm6og/8946594788.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/34037580320.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/41676140065.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021612195999953.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/deritevawavutabiguzixol.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/08tacammuq9sbpe252u3uhm217/22823304452.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/9a130727ee2b7daeff96b1f1dcdebaaf/najulajibavanigagasaba.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a3a5058fa---lefimoxurinokux.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e18784271---35929076897.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cdd9be460a1---fudovinefijavakadux.pdfIn PDF document text
    • https://btegypt.comfile/sinugo.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed56ab410f---muluzaxewupidanasitojiri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=7+letter+word+with+3+o%27sPDF 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_off0000cc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC88 17056 bytes
SHA-256: 336f9667c60dd2b3ea68bcf3498c0a30c841ea02f2d7920346612faba3ee1f94
font_01_sfnt_off0000f901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF901 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11118 10324 bytes
SHA-256: 94e82386c15bf538579df87e5b2c50a0246110d405223427a489e659de6eee73