Malicious PDF — malware analysis report

Static analysis result for SHA-256 d23557dd78fa214e…

MALICIOUS

PDF

76.4 KB Created: 2021-08-21 14:07:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6a9130ddfe30a99a136225f6f974a8c0 SHA-1: f9ee43bea7ab10ffcc57180b122e9d3383d0f364 SHA-256: d23557dd78fa214e1a956b438a7852c99be57d10f22116a4f0e9eb0951045496
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The presence of a URL with 'bios+password+reset+tool+download' in the utm_term parameter indicates a lure to trick users into downloading a payload. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=bios+password+reset+tool+download PDF link annotation
    • https://catbasailing.com/upload/fck/file/jebawojizuju.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/65935545331.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/gbc3r2sdhec5q4o630t1blaodl/30617761141.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4759b360f---27166334496.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/roratenavavusorixisolu.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/jojofavapaderuwepesovujak.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16097280b659aa---darabizoparof.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/a3b23535758a8b0755fcb9de3008624c/gupir.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/gutikupanadenefoxameb.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/90593e8098195fe8559804842182d058/pebalerijazupulezes.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607160c5693f4---64269130100.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/kiseguvixonitepesegedi.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/girasobofiduzetuvijader.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb230b0acae---47094503981.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/b35c1274c550e2d3b18f4c1d99406785/64753792908.pdfIn PDF document text
    • https://heyratacademy.ir/file/96680147402.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/b9beac1bd5e6fb4ba587de90a52e48ea/72129004310.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/it40i8a43nafkallaaitbdis6h/vojurejakovarimida.pdfIn PDF document text
    • https://dvg.asia/ckfinder/uploadfiles/files/zudadaled.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/78914944481.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/66816149350.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/pijanokovemuxejumowozo.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_off0000ca7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28C 16140 bytes
SHA-256: cbdbd93e0e491cf583d9c7adf0d2a7ac448c42a4bdd8d98962690941c4139650
font_02_sfnt_off00010c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C45 10524 bytes
SHA-256: c92fb0d7804412afdaf7f280fc6210a87300dfe0f9457b237debf5d648aa33dd

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