Malicious PDF — malware analysis report

Static analysis result for SHA-256 8710bd013ec8e784…

MALICIOUS

PDF

83.8 KB Created: 2021-06-27 22:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e19264a2e6b6dc4543ef770d93dc4958 SHA-1: c96dc25511ce7d1cfa4c7021122156ab59fe0853 SHA-256: 8710bd013ec8e784ad21f054d92483a4e5f6b53878faf431b0d2f4e4c602cd73
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The PDF structure suggests it is a link farm designed to redirect users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/47e38910b1cbe3ce8b4e55edb96a26c3/58420736285.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/vpr6h1k6paqvq7ehlfsodd6mh5/bikajivimuwufulof.pdf
    • http://jkphotocon.org/data/userfiles/files/pigutitameditozusatu.pdf
    • http://cnc-soustruzeni.cz/files/file/gapamaxavefuluv.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/88a6da45ec77adacc128d5311f1a6818/waziw.pdf
    • http://lamekatus.ee/uploads/ckeditor/files/kaposeziwitusabokasawep.pdf
    • http://www.chubsorn.com/file/files/43294101737.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/68586952715.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8c6da0f7e---35345539381.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607beed8a2c33---21917025655.pdf
    • https://mangonebike.com/uploads/file/mitetuwabe.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609acbe59d2e0---genifiwabel.pdf
    • https://clickkedai.com/userfiles/file/79560903751.pdf
    • http://studiophotosfashion.it/userfiles/files/waruretoko.pdf
    • https://acronimocostanzo.com/userfiles/file/telenotilokikokulisuv.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160863d2b6d143---16885331567.pdf
    • https://aspaeng.com/files/image/files/81932813265.pdf
    • http://computergramm.com/userfiles/file/javenagiruzutijawutanur.pdf
    • http://massvt.sk/editor_uploads/system/files/lumadavuxutalejizola.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e25f2b6388---ruwitedodez.pdf
    • http://airholic.com/UpFiles/WebEditorFiles/file/lerudanixavutel.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a52492a2583---75925074162.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=discus+pigeon+red
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e543.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE543 16792 bytes
font_01_sfnt_off0000fd5a.bin
ceba2849e2eeafafa9888ddc4d6445992d2c9d627fa46953a109f90f3f3cf7b3
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5A 10484 bytes
font_02_sfnt_off0001150c.bin
574f31eacacadf3b32965320656d8f23edc11ca6176bb3e907eb0ff85ad97687
pdf-font-stream PDF embedded font (sfnt) at offset 0x1150C 17568 bytes