Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b19a3355bc6637c…

MALICIOUS

PDF

81.3 KB Created: 2021-09-12 19:17:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8af0a81ef1804fc7deaa206e10f80c1d SHA-1: 34d2926bdb600cf72e3fa544dd05b58ba7ab11cc SHA-256: 4b19a3355bc6637cc826238256a6211b0850525352df1bb6e09c47b7343ff25b
196 Risk Score

Malware Insights

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

The PDF contains a lure that instructs the user to copy and paste content into a shell, indicating an attempt to trick the user into executing commands. This behavior, combined with the ML classifier flagging the PDF as malicious and ClamAV detection, strongly suggests a phishing or trojan delivery mechanism. The document's structure also includes numerous links to potentially compromised websites, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://enslev-anlaegsservice.dk/userfiles/file/61850515322.pdf In PDF document text
    • http://studiobardinisrl.com/userfiles/files/vapimumagezunopuvag.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/93977373829.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/47719187827.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/9dd5f0164ccc06b65fb4615299258c45/54667158567.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/timigukarulizogibiwa.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/dunegolesafuj.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/12413531470.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/mowomifim.pdfIn PDF document text
    • http://corkpotters.com/images/10170847473.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/48381269698.pdfIn PDF document text
    • https://laser123.com/geektic/files/fizex.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/bizuroxalifogudamo.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-10/20210910191305610842.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/somazaluf.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/72310586026.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/161303e805c882---9055247952.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/vamuxazubikivujupa.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/joduzimipokazinutija.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/4cqvovkha6htd0d9o8hqhsdqo1/13351219043.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/15416874600.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/nidurupokugositono.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/65198927042.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/41729116226.pdfIn PDF document text
    • https://wineuniverse.us/userfiles/file/lugekiwulifav.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/30acdd0612083db613b56691e24a3e60/gubaxelu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=moto+g4+stock+romPDF 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_off0000d7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFF 10200 bytes
SHA-256: f11c7f1247a8e7cad33dcd8cbfef4d7965a1c6ae197ad66542338862936f1ffb
font_02_sfnt_off000106f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F5 18792 bytes
SHA-256: 2c4244103b25de94c8937df192509eb49516c31d44e30be82c7fe2276fd42bff

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