Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7ab5d7b06347b69…

MALICIOUS

PDF

179.9 KB Created: 2021-07-04 07:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 53135b0e6635affeaa8a96867ef4f6f6 SHA-1: cb53bb1a13280e9b3d505a19c046d524425f0c3a SHA-256: d7ab5d7b06347b69bba06b57f3e9d189fe69b552eb81046cc6ea7f4f20be3694
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the primary attack vector is the embedded link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9755

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://smilepaper.tw/archive/upload/files/dikobatewaruzelure.pdf In PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160735b133d379---30377349260.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/datuwarenefogomiwulozok.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8fdb0bb333---89081450582.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/xaxiduvako.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/239ba48eaa56714f9e1dd81ddec1faa8/4387038681.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/famifoxinikuforogej.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608caf6ed7b6c---83802938822.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/5fa5a89725d5d9fd125b0aa185004fe3/tozonove.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed1c1f3ed0---11540326249.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/rowajopumusolamu.pdfIn PDF document text
    • http://jordanfamilyreunions.com/clients/5/51/51534e3e38036466a76ca8a024fd4923/File/finomabemafalafu.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/714cf449cc0aee8b68d25770101ef5ec/79085596449.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/29c49649f85f38578dd81df639fb0644/fumesop.pdfIn PDF document text
    • https://soechi.net/userfiles/file/14275275578.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbe3178a65---64830992905.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/giror.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c570a316748---nosimovujek.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/t25m5tagmrl54bvq7shsqnmdvh/jofogowakezuwevuv.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c916f8d79fe---dodetezafixilezulasiju.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742f9558d50---repowo.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/418cf66f4e4668689fb2a99672fe85f8/47576636005.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=first+candle+hanukkah+2020PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00023a49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23A49 20928 bytes
SHA-256: 65b643356f533e93094a6551eb94217f786ce00a72fbc365ede3149091b6a94e
font_01_sfnt_off000270c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x270C1 19292 bytes
SHA-256: 1d010755e1d14292f29c522916b49636d338b9b37454ef97a0ee4a095ae0c4fe
font_02_sfnt_off00029174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29174 10760 bytes
SHA-256: 90fe6f238fc9511f127395602f16ebd17fa384c2bcf4fdc1961ee297b335bea3
font_03_sfnt_off0002aa2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AA2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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