Malicious PDF — malware analysis report

Static analysis result for SHA-256 d87aa3ce757b5597…

MALICIOUS

PDF

90.0 KB Created: 2021-09-04 20:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 2064ce507c9e22afee73b045f3386a67 SHA-1: cf9ca2f6315f189e362c73475f7e3713759cafdd SHA-256: d87aa3ce757b5597c0582e9d69fde1918add72c278aafdca0898d6c0727098db
156 Risk Score

Malware Insights

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

The PDF document contains a large number of links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and contains no readable text, preventing a more specific analysis of its lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9702

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://khotelmarket.com/FileData/ckfinder/files/20210627_59D3B3A8A5EF45F3.pdf In PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c914ea4eab---85013465462.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7c75d5af5---47614445709.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202108201637198663.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/b0a752e970c8e3abf173a5946a08eea3/23166310192.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160766b0de9871---64225274792.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/fonax.pdfIn PDF document text
    • https://ip-pharma.net/data/files/15378747776.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e94b99e9c9b---54263957494.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/28523268933.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6a34a4317---36707179273.pdfIn PDF document text
    • http://berkeleyhigh64.com/clients/9/99/99a482d4bd0dc5522cc24ea7f8204a07/File/26596197510.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160871eadb1b9a---nelubovuwemegej.pdfIn PDF document text
    • https://atl-50.com/files/file/zuvemuxukegokolufep.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/33335307420.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/57458236677.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce9a2570c3---86750485048.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/kudinamodilixukukupegopax.pdfIn PDF document text
    • http://anupbolivia.com/images/files/jelefaxukukatatiga.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/labof.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/c2d79ef55f867c70f6211854afdeda73/sixapeparatameja.pdfIn PDF document text
    • http://www.nomorcantikspesial.com/file/57752339173.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/wodobakurisagilavedexotij.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/76354052558.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2acd89557---77980832573.pdfIn PDF document text
    • https://telenovella-bg.com/files/maxumasagifadubura.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=skmei+watch+1155+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD71 21804 bytes
SHA-256: bcb657c33a5968dd1921215c7426102e01335860ddde967f5e08c71e81cc3150
font_01_sfnt_off000105d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D0 16836 bytes
SHA-256: a048689f32ecc606491b7c3fa7b1ecf3bb7845d2c627b89c408c94b7135815c5
font_02_sfnt_off00011e09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E09 1988 bytes
SHA-256: b10cc94590cfa4a6e40ba925e491acedcfef2f17aa39220726de18202f1042b0
font_03_sfnt_off00012731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12731 10644 bytes
SHA-256: da3873c57271257010d262a13fe0e503e9b38571339ab2dd0b6ce67960a333dd
font_04_sfnt_off00013f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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