Malicious PDF — malware analysis report

Static analysis result for SHA-256 660dd7d3f5533f7e…

MALICIOUS

PDF

92.6 KB Created: 2021-09-05 18:20:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 6caebcf62a2050f93cf0e6e441ab47b7 SHA-1: 5d92d7e048d8a7bd26b2a297f708b94a44af00ef SHA-256: 660dd7d3f5533f7ecdd0bd1bf77144218ddbe86aef5d1408c5e92f59a846a1d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • 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 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://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/2f89cc7f3da7f3574711bcc34dc6bf9f/48370698906.pdf In PDF document text
    • http://gld-lining.com/user_img/files/2983893129.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/vapoxisisedijevuziri.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/klrcqqc2aqdt8e3or24k8qsr5n/5960956656.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/935b933cfa020a3b3e9d4a3210201e93/kepaleromobogodon.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/xazajelabopa.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/bububov.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a330b1313b3---28098722740.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/53860895764.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4167981efb---90187803045.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/c520cc15b3a085b2fe4744a85d255524/xexomazakagosediw.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/16744859658.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16091f58c7006a---sewopodutedujapek.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/oaqtnnv4lkpviucfkt4hba8r96/57014900912.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/70cc1662990796c1e9c09b3ed107188d/13406237028.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/58325334989.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/47375242274.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/12333894680.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/450328804.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/xaliniperajewijudub.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/39400220412.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d42a5def0---morolosalaxu.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/vodinaro.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d90d1615d---titarifawojifijide.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094095dbcc13---67555263723.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c271fa2b99---tikagupinemebaduja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=bialetti+manual+conical+burr+coffee+grinderPDF 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_off000100b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B0 10944 bytes
SHA-256: 5b7ce0c8ae28f38a541d7e3b316ca2ef025591361cc20599124e51d492f28119
font_01_sfnt_off000119ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CA 19276 bytes
SHA-256: bdb7206ced7c5203e61fea9d191e0f8db1d7063f1b8472a2fe58a24318690926
font_02_sfnt_off00014c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1