Malicious PDF — malware analysis report

Static analysis result for SHA-256 22f503744a4c3007…

MALICIOUS

PDF

85.0 KB Created: 2021-08-24 16:17:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5b2cd7c1bdd420a9da6b6a3bf9b54d69 SHA-1: abcceaaad362620cfc0fab4f8806fcf28c0f7c1d SHA-256: 22f503744a4c300711e3c2d0516c0b589e47d1e1b61ce55ae93bea44afb78f8d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to external websites, including those hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, limiting the analysis of specific user-facing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://ronaldtan.nl/images/photo/tulezezoxijosaguruxiwad.pdf In PDF document text
    • http://mynigaoe.com/upload/file/20210629013117.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a45907f189f---33474645161.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c91c339429---gabovuluwubiw.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/94780956071.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/94978081135.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/86720904486.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/xasusile.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/fefasewisafimifadoxizu.pdfIn PDF document text
    • https://performanshost.com/calisma2/files/uploads/27370658772.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/191itplk02u3tufige39ogephp/51206409474.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/9gl61eh5497gn2pi0c732b2bms/wikebibo.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/65972385552.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071659057db7---jofoz.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/ogaru0873tkivlc4372eclr057/rusaxebaxifoluzelavusug.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/43132006782.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/51914387757.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/d6004867e1d55c43b0d3695de92e4b5e/75828861539.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/805736545.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/lesaf.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/bb2f0c6f3e36981f8418743991ab9886/44139488399.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/8895012028.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/1e68bb2428aad8699f68c76ece7881af/zepavejila.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f8e920bf8---gibibefi.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/opqbbjp56eibomftracv9c9omv/82122593779.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=if+clams+are+open+are+they+badPDF 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_off0000e893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE893 16812 bytes
SHA-256: 64c7ef0b25fef358f43346a35180858fa743170942611d11f10694719c648cd7
font_01_sfnt_off000113ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C04 10996 bytes
SHA-256: 52ad1faba9dcdfb1558ea3c36bda5d0910637d13ddd4042d9dfb46cfea05d8d1