Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d8a78f7f95cac60…

MALICIOUS

PDF

99.6 KB Created: 2021-06-27 04:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ede9eef64b6ad9f4c500eee4646a77b9 SHA-1: 99871e4dccf291505459b21c6676bb5156a1713f SHA-256: 0d8a78f7f95cac6067089d9966ba2d1b1ce333d9d6c82f465a4484a28abb3acb
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9872

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://markzone.az/wp-content/plugins/super-forms/uploads/php/files/off6p2vlgmu6af157tt3078rir/87359853996.pdf In PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/49263506490.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec962a7527---14857210347.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e326ba3b8---muzawi.pdfIn PDF document text
    • https://citytrafik.nu/images/file/36904674663.pdfIn PDF document text
    • http://slhs1958.com/clients/18590/File/jazaluxukilefikexeniruvi.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608c980c27d79---durosepunapimip.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/24597394787.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/xegivuvodemoposerame.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/432b51711d8ae1f108b399c95f229229/48232315271.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/15210263036.pdfIn PDF document text
    • https://agermag.ro/mm/file/kifojoj.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bf59ed9cd---bozimelakevikamexogigadef.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/c3bbf1f62d84d1f15a07cf0f54cd5dc7/26406712023.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/b3nb9ko1enavi592itpphouuov/29973263134.pdfIn PDF document text
    • http://orderkai.com/uploads/files/69943422613.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/24881451389.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/8efdc652ea4ca5e6118840a804e5dec3/73846666247.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/mosewig.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc1ea3638b---vawaranekimexiwuzawalej.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/kanasejelaxepupo.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/fa2174cc14ae4edc02f88b820db37a77/62883452688.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/e7b797c829bed4b613753e53a82dced0/jatow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=watch+justice+league+snyder+cut+freePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EF 16064 bytes
SHA-256: 6be8c0c042521f5a71df7666660e0ab63b9e07567b17aa495b0122ea571483c6
font_01_sfnt_off00011dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFB 18544 bytes
SHA-256: db86a9b56b1c9d8d40ad821b8b5d4f755ae24e80c03dddfcf9278e687ef1b1b8
font_02_sfnt_off00014f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001675f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1675F 10972 bytes
SHA-256: 6aec117942002c777679907916469f6b92f72b54027c9b24f6f5060ce9cb888a

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