Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3f036f1aa947a73…

MALICIOUS

PDF

84.0 KB Created: 2021-09-05 01:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 49a59d99b043ff7c055429b721eefc37 SHA-1: c42aec24e16e51e85b1746ed67d99920f4b84c0f SHA-256: d3f036f1aa947a73af17abbf13bf2d580be10fcdfc20564b1c0505fe5d1a8f8f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document exhibits characteristics of a phishing lure, specifically a payment redirection scam. It contains numerous links to external PDFs hosted on various domains, many of which appear to be compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to execute further payloads. The presence of embedded URLs and the 'Payment redirection / bank-detail change lure' heuristic point to an attempt to trick users into compromising financial information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://cructi.ru/uplcv?utm_term=uworld+free+pdf+download
    • http://www.deopendeur.org/imgUser/file/pekezo.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16113f62a01809---wobunebulavo.pdf
    • http://cl-metalparts.com/d/files/914577414.pdf
    • https://85097781.com/upload/files/1865276741.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081cd766aaf2---69286302869.pdf
    • http://surtek.biz/image/files/20150118_163203.pdf
    • http://bennyhigh73.com/clients/3/33/33ce00c6a031cf3b17a3dcf69aaa7594/File/zubasagiwibadojipoweg.pdf
    • http://centromp.it/userfiles/files/xopem.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c151b5a504---66202511691.pdf
    • https://drhuanghair.com/uploads/files/202109010756541174.pdf
    • http://cuoredicane.it/userfiles/files/datamatuboxudoboxubajajo.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/dr1mueuvs2oq3fnmk46an9bbo7/24768530348.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608db7f8183df---rafubisemizewosuti.pdf
    • http://mnarch.it/userfiles/files/rudeliroriposu.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6259cdb3ab---wuxewolabewopiwujoro.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16081ddcaa6e81---ramanepilof.pdf
    • http://curry-box-deluxe.de/userfiles/file/89986240174.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd24d6388f7---ruvazemadapoz.pdf
    • https://censcakmu.org/board/file/files/83451415053.pdf
    • http://grimastone.ru/files/69197650352.pdf
    • http://naoshima-tours.com/images/blog//file/78572144023.pdf
    • http://balone.net/_upload/file///71977781245.pdf
    • https://aprilboya.com/userfiles/file/rapasajujovagukozazoju.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072d190cabfd---goliwifom.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/fat9gsejo388m4rtlogfsgj2n4/livafawesedamuwabaxomeb.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947740ac52b---95947196918.pdf
    • http://metabolit-plus.ru/files/file/fanejowalebowexuxebonuve.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_off0000e4c8.bin
659a4f97e719946d02b386c2238b1c36ce7ee381072c627f55b733490e35bf03
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C8 18052 bytes
font_01_sfnt_off00011372.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11372 16792 bytes
font_02_sfnt_off00012b89.bin
48061923d86d644ef2b19c840ba98183f32fdce1cd2d2b96e6818d42788a753d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B89 10224 bytes