Malicious PDF — malware analysis report

Static analysis result for SHA-256 d61b7761929c6d7f…

MALICIOUS

PDF

99.1 KB Created: 2021-06-30 12:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7074bda161c1cfedf56e14b431859d45 SHA-1: e18f9e925e7ed764fb9572cf27014546a386a594 SHA-256: d61b7761929c6d7f1530849390ffb99b7099a3f0aac991df23cf8f279f521af6
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external URIs, many of which point to compromised WordPress upload directories. The ML classifier strongly indicated maliciousness, and the structure suggests a link farm designed to redirect users to potentially malicious content. No scripts were extracted, but the primary attack pattern is the distribution of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 5

  • 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://garglob.ru/uplcv?utm_term=types+of+digestion PDF link annotation
    • http://3dprofi.net/images/uploads/file/wawapenujigavalilikonup.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/fud89ghpf1a9tbhtpgdrs5eqs9/56616339327.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/122c5c65672d8b48a8678b7808464c18/43441446698.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ddab5093d---88911073211.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/45244486680.pdfIn PDF document text
    • https://citytrafik.nu/images/file/xavadanalurum.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/votuvipadopujad.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16236891915637.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/37022700417.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802d13923a5---doderajibevokanafu.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a0993177f---25033763974.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/iqachbaf678om2h9l4irrmggin/70711998727.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/62600371554.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/37689264483.pdfIn PDF document text
    • http://josephpowellfamilyreunion.com/clients/0/04/04c15d356d3082020e114f8c0300f46e/File/zamaxuwom.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a40a392d00---91418382201.pdfIn PDF document text
    • https://elektrona.cz/files/file/30215069321.pdfIn PDF document text
    • http://zionhillfirstbaptistchurch.com/clients/73368/File/40078172060.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6a3bd3c31.pdfIn PDF document text
    • http://alptw.com/images/files/tezudo.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/talogopevonunebupuvef.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/8451900367.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/bepomemabatojikipevupe.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a18a10191be---xidemojagireke.pdfIn PDF document text
    • 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_off000120d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D6 17360 bytes
SHA-256: 006e8bba2416c78be33d2bcbc04d2bfe7bd2b958f222321bc68c6909d719a7a7
font_01_sfnt_off00014e27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001663e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1663E 10444 bytes
SHA-256: 2f9645013b19bd208fdd8bf74c3a92b061ad39369050f6fa02632db8da326d1e