Malicious PDF — malware analysis report

Static analysis result for SHA-256 8282a06fc828b3b7…

MALICIOUS

PDF

73.9 KB Created: 2021-09-03 09:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 42e2f05a9ea9c2796fb87e156b4b4e50 SHA-1: a464f197ae9d9e68d252f33fdeec4e3868669bbc SHA-256: 8282a06fc828b3b7e8ca61eecc4bc2db5f96e8312a80a81dc5dbdebc033dd225
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript, which is often used to execute malicious code or redirect users. The PDF also features a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final destination or leverage compromised infrastructure. The primary purpose appears to be directing users to external resources, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.area-tlc.com/public/ckfinder/userfiles/files/jevotela.pdf In PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740ac8b6f13---58512297314.pdfIn PDF document text
    • http://odumakus.com/uploads/files/40353774374.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/98408716898.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ee474e269---xalofexegemodigerugi.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/ul5sr3natkhr1uq6j561aa7dk2/40052983630.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/mexolixiwatuwog.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/m4iv9ln9h2pravqfhq0cqr5l66/65509429687.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/vipebewusemazexodulokol.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/gowuvijazapi.pdfIn PDF document text
    • http://highlandlynxotic.com/clients/7/73/73cf6ae24f8ea70eb1cbac1dff6b0f9e/File/nubilojin.pdfIn PDF document text
    • http://magicdiscoradio.hu/userfiles/file/89646749520.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/56669699392.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee6f0d72c46---43102865481.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a337c3ebbbd---mixanataloxubipaganed.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/nitutodaxetiwuv.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a306322c5---besufomawodaxoxorujeruwo.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/fivixifujated.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/960a356ef8f056fdd0fe430d6079119f/24228427462.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/1c81d4f55fda04c11c9704e3ec5d70a9/53993296757.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/11647970441.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/semukofogotib.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/funisamitevigavu.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/4822bd1f3a065642518bf810fb0ec01e/tamidojirepegenega.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/89204862782.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/fajodubiwebovukefisixesaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=whirlpool+self+cleaning+wall+oven+manualPDF 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_off0000c040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC040 11076 bytes
SHA-256: 815d530a58b95a1fed16ae47ee5c8578193b42eda22d42b630de054960ab0357
font_01_sfnt_off0000d9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E8 15812 bytes
SHA-256: c0edcc5cf08f6af1548340d3e6402bb3ffce9238f802c6bcf81375bceec000d0
font_02_sfnt_off000101c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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