Malicious PDF — malware analysis report

Static analysis result for SHA-256 a07d183d80aae6ae…

MALICIOUS

PDF

147.0 KB Created: 2021-07-29 14:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6e130299af945c6776a0d5997113053a SHA-1: adef4aee6fe521f0f2c99dcbea75bc9c5c0c9bf6 SHA-256: a07d183d80aae6aecd36477e9daa17136e6e4c16e39d0dca728bec5b4f83a747
164 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to external sites, some of which are hosted on compromised WordPress installations. The presence of urgency language suggests a lure to entice users to click these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9645

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://flexa.cz/docs/file/fovenetigorof.pdf In PDF document text
    • http://motorlustor.net/userfiles/file/zanalevowuput.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/19626006129.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/d0c807bb36a10caae9b11ef171974ce7/ziselupaguf.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/75041066234.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/genenam.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/veledog.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/vimaxix.pdfIn PDF document text
    • http://livinglearningandworking.org/clients/e/e0/e05af8355f71d8da3aa90f500b9284b3/File/90619615069.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b4ccbbba6---gesebulo.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099b1d28d2b5---16132341163.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160fe20017c4ec---futajimuvidusamozo.pdfIn PDF document text
    • http://smithmaloney.com/clients/3/32/32eae1a42220421eddab78da2f55685d/File/84435371639.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d40fb1de94---depuzoniwu.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bsb37s2kf5j5fd8v71r2u34i93/5483369570.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/d22fe1164c72e3572f2af9c140db0863/37000592589.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/f9ab828f34ae9b99d3d02ef19d023c93/16206974642.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/jv33mqavq1cp0474pcbo2osvj6/voledajokaviniwiguwez.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/bixufex.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/bagopizekax.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a40f5f90603---97765330171.pdfIn PDF document text
    • http://minerva-collection.net/files/files/87527654809.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=what+is+siren+head+phone+numberPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A66E 17200 bytes
SHA-256: 8b4b598834e69c1ae84b6f3209dc65fe4bc5d225ca9023ca005f7cbafc5b5c37
font_01_sfnt_off0001c005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C005 21380 bytes
SHA-256: e3e1a6c359f738e54ca73e2fec86b16cacffc6bb03cff19f166f52ca09114ff7
font_02_sfnt_off0001f368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F368 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00020b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20B75 7608 bytes
SHA-256: eb1cc0f1ba7d8f346f45080f72151fa939a59a10386c0407ea9adb1d4995f104
font_04_sfnt_off000224b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x224B8 10844 bytes
SHA-256: 0edc3b2145c3eade4ad323d2c3e932dd07d08fbc1364bf047fe726cfa8820858

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