Malicious PDF — malware analysis report

Static analysis result for SHA-256 8061806d9f9370a1…

MALICIOUS

PDF

89.1 KB Created: 2021-09-10 13:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7a42be395a4fdca4c127accde59260c9 SHA-1: 610499a0e7f20118c1859d71944bcf4e5818bbf0 SHA-256: 8061806d9f9370a1a5972ebbd639339f9be0c0ab1cbab7558c05d67f143e47e7
156 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with many URLs pointing to other PDFs hosted on compromised websites, suggesting a phishing or malware distribution scheme. The presence of multiple links to potentially compromised CMS upload storage further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348b667d26e---salirukepopo.pdf In PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/motebazilofo.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/56548333481.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/4b93dd3870753ba27acf4b16809cacf0/votilosodipanutagedogab.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138f21d73b7b---pukubemuton.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139c8d977448---gudilajanevafinajirora.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/87606306416.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/fofirapoles.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/63687411748.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/42648646431.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c2f10869e---lutegejolozugarepugisul.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/39185751377.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/gopivegakarofi.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/pabekedabukinizibi.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/rizetu.pdfIn PDF document text
    • http://cgemfoco.com.br/ckfinder/userfiles/files/nawekefewavukubum.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdd8c08b25---27177803956.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133177bc7f03---59612703060.pdfIn PDF document text
    • http://konberdbio.com/upload/files/kanis.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/wakavuvuxifemaxobigiwaja.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/nezuvekosesit.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/50923706347.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/vijufewujo.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/94807477342.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16131169188b2b---gibezakawegus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=kmplayer+pro+apk+crackedPDF 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_off0000e700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE700 10412 bytes
SHA-256: 52c60de4156cf6131b574d4f73e30205d2cbc290f444e5255de62fb46f54cd10
font_01_sfnt_off0000fe99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE99 24224 bytes
SHA-256: 15f4039ebd0741e91d6aaa1a9395ebc2069d514a4f38abd842eeefee38a4eef2
font_02_sfnt_off00013ed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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