Malicious PDF — malware analysis report

Static analysis result for SHA-256 beb133d55cb19351…

MALICIOUS

PDF

84.1 KB Created: 2021-09-11 21:21:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 78a33e5005c357c0c823f84720d88167 SHA-1: 13c1d6708d9b73977d4d31f2c51d9d4d001427d8 SHA-256: beb133d55cb1935115abc55d09f55933fcf6557dcd1734562d4f1c8d74b153d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://sanvexe.vn/webroot/img/files/gabimive.pdf In PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1ff98fde9---funodukabibepu.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/jibije.pdfIn PDF document text
    • http://sbairs.com/datas/files/92875021429.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/65590742053.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161366ffbc7dc5---14555168716.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/42089342955.pdfIn PDF document text
    • http://www.lalorraineperdue.com/documents/71771057496.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/zijewegipovepav.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130281846be4---jatezalegezimo.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abf43ad431---pedenulosisuwow.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/daraduwas.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/tipifirowa.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210903011840.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/kiwaranolekisewap.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/80045723120.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/tonazit.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/28848303532.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/pojodexipuxumopikokelalab.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/37036340281.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/oedmi4fs0qb8mu8rspm4kv48i5/58697323833.pdfIn PDF document text
    • https://subded.org/userfiles/file/7627156675.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/sogokajejos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=123movies+love+after+lockupPDF 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_off0000df81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF793 19608 bytes
SHA-256: 264f8dc4b6a03987626e2ba2f536d308cd9d0f3de4cfe41646d33be75932f273
font_02_sfnt_off00012a66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A66 11044 bytes
SHA-256: fe08f90983c3f2ec330cb85c01ce51c290a0a39c65a28f2dfbd22bc63244efa6