Malicious PDF — malware analysis report

Static analysis result for SHA-256 7422291ca7ceb423…

MALICIOUS

PDF

84.8 KB Created: 2021-07-23 15:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 565436f3ccd28024d28ece5058ce21d0 SHA-1: a5807ece82cd9c3ed2b1e8051a6e0d892c4b8f06 SHA-256: 7422291ca7ceb42357cbd9133e9b1f032bc41e2d19808e30b40e28a1877109cf
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

This PDF document is classified as malicious, exhibiting characteristics of a credential harvesting lure. The heuristic 'SE_MFA_LURE' indicates the document is designed to trick users into providing one-time codes or MFA approvals, consistent with phishing tactics. The presence of numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggests an attempt to distribute malicious content or redirect users to phishing pages. No scripts were extracted from this sample, but the overall structure and heuristic firings strongly suggest a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://machinegroup.ru/img/outer/files/nutukumunukibibarofas.pdf In PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/28f6bc88f65b12fefed786cfbbffcb36/nazamafalimivi.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/banedaremuxi.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609466af741c3---73179941332.pdfIn PDF document text
    • https://rajakedua.com/contents//files/pikomexe.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160db8ed5bbea3---28977390774.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/wubilano.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/b37afb768dbcff55fd08da1e0d221256/36473146762.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/xiwunaderud.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606e47566ebc7---28503221187.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/sasepesufazukomuworif.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/9153f208b8ddab7c9df99e9e2cfadc28/witan.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c1b1db11d---72749741185.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/651386990.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/mikujujedomamuxuse.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/suvugusudazekotoxebe.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce5e603434---47692096788.pdfIn PDF document text
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/oiq8jbif57l85qun614dolp4b5/51497912251.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/50915b6a9c9920772d6b654c384d6639/14946262797.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/temiwogaxijopifogagebofu.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/35308578308.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/fipego.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/08c4ca544aca39c90cab3b8e9d6e3f99/mazosozujamem.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf4549dd7d---80566221704.pdfIn PDF document text
    • http://ndt-ultratech.com/files/xasoba.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/tvmfuroturtau7k7cfcgmr6ec8/nodageripaviwisex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=afk+arena+codes+2020+mayPDF 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_off0000e678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE678 17236 bytes
SHA-256: 413eba811d03b073f58504bbb26ec90d94c6922e0e3aaea2b85955e61cc82019
font_01_sfnt_off000113c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BDB 10828 bytes
SHA-256: 949c393a5eae4e8c5393689ba362e69f5a7f43def3384e3b5b518ef9b32c7d66

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