Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bc7d74eda4ae1ec…

MALICIOUS

PDF

97.3 KB Created: 2021-07-30 10:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9e30b8f264ff99775cd95ccce368fd44 SHA-1: 35479951526fdbb789abdc8593638a4ffe060ad7 SHA-256: 3bc7d74eda4ae1ec3180d8f80a860728ef5bc637b56590004aaad2e3947ce99b
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, suggesting a link farm designed to distribute malicious files. The heuristic 'ML_NYX_PDF_MALICIOUS' strongly indicates malicious intent, and the presence of a 'Visual download / call-to-action button lure' heuristic further supports the phishing or malware distribution scenario. The document's structure and URL patterns are consistent with attempts to trick users into downloading unwanted software, potentially disguised as drivers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9637

Heuristics 6

  • 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 https://nomylo.ru/uplcv?utm_term=canoscan+lide+25+driver+for+windows+10+32+bit+free+download PDF link annotation
    • http://progettogeometra.it/userfiles/files/16140185433.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/virax.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b8fa72430---tutemokerevogos.pdfIn PDF document text
    • http://sieuthibds.net/images/files/pojorurewesujoxakolova.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160973fda6694d---getosikimufofekudilu.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-3/20210603130441593742.pdfIn PDF document text
    • http://mtprospectbaptist.org/clients/7/74/74f10a8404da00fab064704771972c19/File/kumivuja.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/lopiraxejeredutuwel.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/remuxasabikikakaguvuviw.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/65214663669.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/18850406557.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/4bd75946c5382507ecc44dc8cd4a53c8/sufilozutizeja.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091821f914e4---54420144496.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/sasomipimewekurutemokaw.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/xapoxexulifavogi.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c433f525c7c---39017202287.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/58135199411.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/kujuwefunekidudad.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/7328593059.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/76492424401.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608396931b737---14930001702.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/597eb14ddf5fb0e69092243e9c73baa9/tatidasimibadezopibapitup.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/183b36e2a2dbe9a31e9519f0702d81e0/43841257839.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/43ea7a08738fc828a16ddc96d6fb7103/92130185830.pdfIn PDF document text
    • https://digireg.ch/upload/72918674849.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfce8c255a---tiwat.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE0 20636 bytes
SHA-256: 152a81832f784f814c06962337fdbc5a9c03e2255ab3cee8d67348bf4e83f8f5
font_01_sfnt_off00011da9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA9 16684 bytes
SHA-256: 5786d7639d2cc1522a1a3889fae5b5c9fbcbd5f5c9de2f5a2930a0e54327038d
font_02_sfnt_off00013546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13546 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D53 2688 bytes
SHA-256: a2ac081e08affb0ecf0a940f0eec8b4be73ee6624f5ae6ef3b741cdea718dd26
font_04_sfnt_off00015893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15893 11392 bytes
SHA-256: e49d72d07cf113217ec5e545e22ddfa497281e22057806163a012c945d47588b

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