Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8f3779c2056ef9d…

MALICIOUS

PDF

86.7 KB Created: 2021-06-30 02:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ef38bc205a3698c2057e3fe33db0b8fc SHA-1: d38980339c34b0db825131179e9d4530ca4b2cfb SHA-256: c8f3779c2056ef9d4fb38335cea8864fee8a2589645402d31e85251044919ecb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and embedded links are consistent with a malicious document designed to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pima-alarms.net/slicice/file/zebidezabutipasuxidujor.pdf In PDF document text
    • http://pappteam.hu/userfiles/file/94911121990.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/4adcf5c446596be0a412d308158a1daf/89538127475.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/c4d4a0cb296dbd0f49f51cbc2e590748/334864370.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/wobir.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077883d56a49---54616055818.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/8374460499.pdfIn PDF document text
    • https://istanajp2.com/contents//files/10520760107.pdfIn PDF document text
    • http://sunarfactory.com/userfiles/files/bezun.pdfIn PDF document text
    • http://yongqingtech.com/d/files/xakekasurozub.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c01706e99cf---30409524426.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210523163226.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/81701810968.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/91770662389.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/woniponefukonu.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1842b28fea---norivamu.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/0705a1f3cdaacc9d5bd37f6d33155e36/sivusupajudosipaboxenutet.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/14221280195.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/lejuxoma.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/gaworawuvenajutidese.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/4e7bdcbc5eded2ce869bdfa93a9afb08/56619631318.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608081e0cd403---79791147526.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4c6839a3b8d373da13f65acd8862f97f/doxeguwedogake.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160add393c70de---65656255737.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/13566787962.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+max+your+base+fast+in+clash+of+clansPDF 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_off0000ef0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0B 11132 bytes
SHA-256: eea455fe3262937fd0d8029650a10fa37f356aae7586a9444415e64d701ad539
font_01_sfnt_off000108e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F7 17096 bytes
SHA-256: 7ba0be3724715b49adc61e21aaacf3ab1f00d0a57653deae7668b077430c362f