Malicious PDF — malware analysis report

Static analysis result for SHA-256 267011acc6094981…

MALICIOUS

PDF

83.0 KB Created: 2021-09-23 10:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 65e763bec55921fa110c1818fe231bae SHA-1: 20fa361b3cb6bacff2cd25281fe2d4b4d9b1c683 SHA-256: 267011acc6094981ea504ffe8e64af44638f4dd717bb26c704849453fc5cd48d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are identified as link farms on disposable hosting or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these redirect links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.la-rocca.pl/app/webroot/files/files/12785453598.pdf In PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84399702755.pdfIn PDF document text
    • https://ckv-siemreap.org/ckfinder/userfiles/files/fivet.pdfIn PDF document text
    • http://szwygs.com/upload/wokidi.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/joroviregexikagovalibonox.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/21755887074.pdfIn PDF document text
    • http://c-amc.com/upload/files/legivazetesidetavuwele.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/xanutaligolaj.pdfIn PDF document text
    • http://geodez.com/pliki/file/41124681959.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/wesafavojis.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/9eaac9105250a7e39641bf881ae4aff3/zovejusetilik.pdfIn PDF document text
    • https://contabilidadegoncalves.com/fotosempresa/files/jekupasoresupanugelenise.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/wikixosekiza.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210917030926.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/jurazerilimujadagom.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109111257282522.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/gajelepigekadukolo.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/6943625626.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/rizuwokijuraj.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f098c1078f---gobosalabenako.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/dewiwidolumuko.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9cfe2f76c---ditud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=best+app+store+androidPDF 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_off0000e17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17A 17704 bytes
SHA-256: d38912611310bb6ffe7757bd3ee1305d92c97c3f2fdf5cbde89e1b5f0cbca5fc
font_01_sfnt_off00010eee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEE 10392 bytes
SHA-256: 8b850b724e27f905b9a03ea5dd3aadb1d4ba610b8e4c62fb8a8f716ea4191f83
font_02_sfnt_off0001269b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1