Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9974cf4be387848…

MALICIOUS

PDF

83.5 KB Created: 2021-09-06 02:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fa41e7029a90a6ead624797755413562 SHA-1: aa91785bf86b4be2c9d4adf89cbc1069be2fe13c SHA-256: b9974cf4be3878489eb564549e13bce0eb1626b6188133ce8ec462054c58e960
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external URLs, several of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis suggest a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://st-ark.it/userfiles/files/11189411808.pdf In PDF document text
    • http://arniestribu.com/campannas/file/49598650732.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/gisatexuzanevep.pdfIn PDF document text
    • http://186086.com/upload/files/jedovalalojuvil.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098301060b8e---97232515578.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/lurokese.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/6un8qjqjoc6ns6vf825v5f7r76/witakabafurexajapixibifik.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/5eadb8881d58555ceff035a91671e62b/4037864238.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/a6pr7v8be9gbkpj52pr9n9471a/44617031033.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/12254863728.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/94739553283.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/rb8je70k48i4hc8osvs6aol1h5/nirinilipena.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/1b94306febf9965fb8edbf799197874b/50386909230.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788b06bd3e0---foziloxuzakebogef.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/71182924115.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e77b7caf160---28740403320.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/94180883126.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/babiporofiboget.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/zarojolilojalidefufa.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/45618741402.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/a8cdvilcl8jf7v3erten0tk4ol/96916044308.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/zaxutobi.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/77988604239.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/gabivuzuxajopofivis.pdfIn PDF document text
    • http://iworking.vn/uploads/files/69241553679.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/sezosemusigekudutab.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/fumiloxodudov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=airport+extreme+base+station+model+a1408+manualPDF 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_off0000df48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75A 17360 bytes
SHA-256: 68f1a18526f94649588e32ba94f73df9c7603d0ef2cb92cca39f6692b7ff9b7e
font_02_sfnt_off0001250c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1250C 11336 bytes
SHA-256: 5e9f1951e4a9ee75fb2e6540d817d16135f1262ddf404d69ced1d9f9eea2edee