Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d49217e477439c0…

MALICIOUS

PDF

91.9 KB Created: 2021-10-07 04:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d7cd84ff2420abe6fa700672e5dda1a8 SHA-1: f85bbf93ce94b94139d2185943e7d0c8bd722428 SHA-256: 7d49217e477439c0d80f01d637fac553af2f78887412367c0d97e16bc4f1f4b7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external sites, likely for phishing or malware delivery. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://pistant.ru/uplcv?utm_term=ed50+to+wgs84 PDF link annotation
    • https://stichtingech.org/ckfinder/userfiles/files/zazananulujivi.pdfIn PDF document text
    • http://1666-3668.com/attach/userfiles/file/mozawiripobujut.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16155b1cf7e198---43409631031.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/datusawerezevif.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb5f1478ec---48363118494.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/35712138837.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/dapuxejitopadobu.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/finabibuvowololo.pdfIn PDF document text
    • http://klhl.com/userfiles/file/wipateli.pdfIn PDF document text
    • http://finchamauto.com/pics/muwopan.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/27129625384.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/ravomeraloveri.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/xepimalure.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/75793412684.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/56a1df7ef05982772dbb63bdf12a5965/61621526782.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/mesuxubitasiw.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/72188267771.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/xotigunolegosuxajewazi.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/7046316351.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/vimifegapejulejisevagep.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/17625078404.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/74594230041.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/kobanibena.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/91520964124.pdfIn PDF document text
    • https://sistemkabin.com/ckfinder/userfiles/files/87694367288.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/44969810172.pdfIn PDF document text
    • 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_off0000fc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11418 10396 bytes
SHA-256: b126db2483f5e8b1c355b409672e384ae8e6ddc75a109c044ebf129ff019638e
font_02_sfnt_off00012b9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9F 20620 bytes
SHA-256: 64fabe9d66cb99312a5880dbe47fba201a5af0f0a05cac95ccd0c888b838cb4f

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