Malicious PDF — malware analysis report

Static analysis result for SHA-256 21d880233f28195c…

MALICIOUS

PDF

83.0 KB Created: 2021-09-05 06:18:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a47303cb0b629cc7715d3d67c6ae6135 SHA-1: db9ceb1e19ba0b5345827d3ebd3ba0e5321560b9 SHA-256: 21d880233f28195c9bb27f80404272aedee153dbbbeb792075ea5647fcd1c8bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=computer+science+mcqs+with+answers+pdf+free+download+for+nts PDF link annotation
    • https://ckmusicdesign.nl/userfiles/file/68856178888.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/figikigijugepidelen.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/3e47bc31af5366b72314cc853c5bc62b/misakinomifilusine.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb60e8dc73---sidojuv.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/dutijagowezab.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/vosufudusazixuxodaviwamor.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/36017317211.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/64981592458.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081be7a9f993---bopum.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160945af29f7e8---salazisurolemunowererunuj.pdfIn PDF document text
    • https://hirurgija.me//files/88469400807.pdfIn PDF document text
    • https://nusbetaja2.com/contents/files/xedamemewubeloli.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/51151343999.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612498b617d1d---37397177714.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9526941523.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210903024658.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/1709976332611172c747274.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1611602ff07469---sexebineb.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/valitesokeguromepidotebem.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/56l7ntv9kshb421cgajrb6g0ee/26729683061.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/4afd42d8e76d83ffd3ad7dc6bdbab728/zifumobozuzuv.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/44321296558.pdfIn PDF document text
    • http://nensi.si/upload/file/dotozebinupeke.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/34344739623.pdfIn PDF document text
    • http://irodori.kir.jp/files/file/fajuxigixo.pdfIn PDF document text
    • 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_off0000de9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9F 17584 bytes
SHA-256: c7ef22bf250409124967301161c793aee9c51a4c1b181a5573eba64d95122558
font_01_sfnt_off00010b8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8E 11248 bytes
SHA-256: 7765a9386ac45855efebca693ae731c718eae543d773da90f4356d5f8ef7cfa5
font_02_sfnt_off0001259c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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