Malicious PDF — malware analysis report

Static analysis result for SHA-256 0be5a1b65bc85611…

MALICIOUS

PDF

78.2 KB Created: 2021-09-19 22:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ebfbd7c9f0820757169412036317e08a SHA-1: 4e6c4c1f6346a0f6a9bc0787fe9b50ac3963b783 SHA-256: 0be5a1b65bc856111032de2d014dc4683d6f4aa871070a0062cfec15ae6051bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=adb+shell+commands+list
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405308da634---pugenekixalosubuj.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/65c1385c6688ea07bc624a7efeddbc03/23556959943.pdf
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/mifiwutegakesofutipezipo.pdf
    • https://djecijagarderoba.me/userfiles/file/44965432415.pdf
    • https://rajnnuhiddje.se/userfiles/file/zukulukumumivuxomuxele.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b30d1d0f6f---27275748833.pdf
    • http://abwbaltimore.com/uploads/files/86522493698.pdf
    • http://watthaistuttgart.de/userfiles/file/jubuvejopizolezaxojajob.pdf
    • http://duet-czluchow.pl/userfiles/file/15928249126.pdf
    • http://preiswerte-unterkunft-papenburg.de/mediapool/45175142448.pdf
    • http://onlytech-tunisie.com/userfiles/file/luretilibikeg.pdf
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/40493011530.pdf
    • https://atrax.hr/files/81757643243.pdf
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jilelejuwotosip.pdf
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210908082229.pdf
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/teganofapubanibisa.pdf
    • https://mjrspot.com/fckimages/file/62489318475.pdf
    • https://pasarangroup1.com/contents/files/robefojujavad.pdf
    • https://watertorens.nl/userfiles/file/kamitovototoxitanizujot.pdf
    • http://spbmedax.ru/sites/default/files/uploads/tojozilibubetugebepuboba.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-9-4/20210904210823487531.pdf
    • https://bagstyle.uz/images/file/21687059263.pdf
    • http://meyanko.com/userfiles/file///fodofes.pdf
    • http://urparitet.ru/admin/ckfinder/userfiles/files/zodawadoxonene.pdf
    • http://bora.su/ckfinder/userfiles/files/29266932889.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdbc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBC 16792 bytes
font_01_sfnt_off0000e5d3.bin
61f94520b016d8ea18069125b9555c8932307f0a16ebb8880407810ebc704efd
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D3 10656 bytes
font_02_sfnt_off0000fe0f.bin
505755cbffc833ed8ae2963cfeb13813c5982cab445bf18920f16067b50102cb
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0F 17460 bytes