Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb728bc38eed2e15…

MALICIOUS

PDF

85.5 KB Created: 2021-09-14 09:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0f74b5792635d36b317e1a0823bfe284 SHA-1: 221515c044bed367db8247244b4547348244c056 SHA-256: fb728bc38eed2e15af9cce43c8192a8bfe051667dd4205eeb1391fc4e474c76f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which are flagged as link farms on disposable hosting or compromised CMS uploads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users into clicking links that could lead to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://abcgsgeds.friendship-match.com/upload/files/75584883720.pdf In PDF document text
    • http://brezov-gaj.si/uporabnik/file/46271630769.pdfIn PDF document text
    • https://italvaping.com/file/73893026956.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109041111572733.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/8bb2f1fc3f01962d1602affb1cc8caa0/56786663845.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/43191325572.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/70068824022.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/39371046307.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/gexenisezikivulerifafi.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/86765000513.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/sababokuvif.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/bakukofagamu.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/66929069694.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/venutowilofebefemawap.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/161379f1f20ea3---69149214253.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/13083088747.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/raxidekamonapiwogulemu.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/18653997338.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/81240176617.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/c3cee055de711a3abbb114da6ba48cba/rekutojabufukuz.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/nonuzububiku.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/49652172549.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/46415596976.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613da7b74e9bd---duzewozeredagaxek.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/6a8eebe3286d307d40470c70e3abf196/kusewujilipivatujonigup.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/80701838165.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=xvideoservicethief+ubuntu+software+for+android+v2PDF 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_off0000e70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70F 18264 bytes
SHA-256: 78d2a77db3e8c965134a7d907bd02538eba92ba15d1a0bd03f1c05081254e60e
font_01_sfnt_off00011645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11645 11048 bytes
SHA-256: a3a55e82b2b567d1616af7dbf143c277770386b3b53c85f298d99020619dde71
font_02_sfnt_off00013007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13007 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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