Malicious PDF — malware analysis report

Static analysis result for SHA-256 b937974473337c54…

MALICIOUS

PDF

116.2 KB Created: 2021-08-11 04:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ace579f6ff0d98dcdb5b71f8942b3bae SHA-1: 5c62d2e84b6c8e49a7f7dbf424931df576e9af60 SHA-256: b937974473337c5407cdd78fbf29b3fad0a350e566bf8bbf154ecaf3326718f9
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to websites hosted on compromised CMS platforms, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.jokilaaksonratsastajat.fi/file/pasenexoxegipitejopema.pdf In PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a1136041f---zezifizedanupisi.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/puxolumonuni.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c110256abeb---kolukamuvurumajagolof.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/kstuettrthu6fa004r868ld1u1/fugav.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/048d8d53704fa11f03d5e0bffb7b82bf/43671564830.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2910594163---57671974108.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/xubabezenajujovanirepezo.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/41408604469.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/fc91d9180470bb29c94a6b1360171a76/vadazavikudasekugawasowiz.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/82796877137.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1d3651bbae---18629090304.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/darenasojifezez.pdfIn PDF document text
    • http://belovosushi.ru/files/gewefuduwulezivi.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/3961393007.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/tudalipevalarukaf.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/m4sqmne7q7248asle103oq0h26/81042360924.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/392f77df431ab4547b5f31390758ed96/vemadanulogamiluv.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/84199819785.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9e6bc3424---75884692045.pdfIn PDF document text
    • http://hasyo.net/files/file/88068526811.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/24697413882.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/78401391854.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607892931fcbd---91058622585.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=goal.com+chelsea+vs+real+madridPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001662f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1662F 10604 bytes
SHA-256: 7baf3f40a2acf59eacaa02263105a70a8d045d9b2926a54d601279dbc091980c
font_01_sfnt_off00017e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001967d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1967D 16576 bytes
SHA-256: d6ca688640d1299de2dafc4f57b97b5dbe988daee5213477e3597cc93fdbe897