Malicious PDF — malware analysis report

Static analysis result for SHA-256 37d4d5a06e60c3ba…

MALICIOUS

PDF

84.8 KB Created: 2021-06-25 15:22:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ec30df5e8a4e1335df640b2f36ae17ca SHA-1: 56e5179117248edabef9f6d285480629aa110821 SHA-256: 37d4d5a06e60c3bad97a01efbb418edb8c9620422fcc2c82b6ad2abc35ae7214
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of PDF_URI and EMBEDDED_URL heuristics further supports the attack pattern of directing users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://crewmak.ru/uplcv?utm_term=human+adaptability+an+introduction+to+ecological+anthropology+pdf PDF link annotation
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/1da3b29312c383a03f05cba9f688ed79/kiwuxawutiga.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-6/20210506191855899685.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/cee2bcf99ef8cfc9c4b43f421d1f0b23/92369498523.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/33174811892.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/gojula.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082ffeee0f61---koxexobuvavewijofufa.pdfIn PDF document text
    • https://socohoteldanang.com/uploads/image/files/lexufe.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/farelopuji.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160862d0b4c5c4---81615733809.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/3636218404.pdfIn PDF document text
    • http://alkanboya.com/files/file///lojunile.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/zufesirileruda.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d323ad5575---lokowujisakopategapu.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/vezotakofetivoresu.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b982adc5530---51380616758.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_off0000e8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B9 16740 bytes
SHA-256: 7641d86e34724a6c41b80035b00c53dd634731aa86aef0680d2767dfe8f88795
font_01_sfnt_off0001140f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C26 11244 bytes
SHA-256: 28cee3940450bb495e3971461aeec85d06162ab2c0a80f4b7362d2ea4c448678

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