Malicious PDF — malware analysis report

Static analysis result for SHA-256 da79e898607a4da0…

MALICIOUS

PDF

76.3 KB Created: 2021-09-06 18:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 50bfe91f54e000d2138e4b750b57bca4 SHA-1: 7d3c014c913e5f19a83c8d76d539e32029a7b004 SHA-256: da79e898607a4da0b9a5941f61eb152f3535259bb797ef52b200bf68682f787c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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=control+statements+in+java+with+example+program+pdf PDF link annotation
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/ad5b0001832c27d22f6ccdf49fd0876d/79497682187.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/wutadazafes.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c72877e5a---zakudotax.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/56345282784.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e9c7b50ee---58136300234.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c9931d5b26e---towaxipeleputesuvovuwav.pdfIn PDF document text
    • https://samowar.ch/upload/file/60579761912.pdfIn PDF document text
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/jenibuzipobezikonupato.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160dc830504942---tuboxawinifoxuni.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/vozidijitubijelituxazidot.pdfIn PDF document text
    • http://htygroup.com/upload/files/pemowixegubutebujenuz.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/febagagupanonewavisuremu.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/8e03e564280894e625cd68bc799fdc9a/27224865787.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160705fa0e368e---gofegixujabufimokogex.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/53001908412.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/xijamuseparuwuri.pdfIn PDF document text
    • http://abpaluso.com/upload/file/69660626676.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/4227a496f4afd9620a7f9f1ad5204e44/2959329225.pdfIn PDF document text
    • http://ambartakip.net/belgeler/file/88307482138.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/91810683360.pdfIn PDF document text
    • http://thietbidiensino.vn/media/ftp/file/15440347176.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/6091626155.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_off0000c381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC381 17608 bytes
SHA-256: 7b4e7a37d24511fe5f4c6835eee76b8391f35d613225af41e72daf7aa29e5806
font_01_sfnt_off0000f0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DE 11360 bytes
SHA-256: a685115629c8a64338962a1298a80ec7646325474ffb92bd29342aa5749141de

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