Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3f8d8b3cfc45e72…

MALICIOUS

PDF

76.3 KB Created: 2021-09-01 05:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4e0ca8aaa5f0b6804881d86103af21af SHA-1: 33392e743a1e8d0ea3401e1f6658f283fb5a19b1 SHA-256: f3f8d8b3cfc45e729b0131e36b29e9388716d88c632144d0e3a6430305ccd38e
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of external URIs and link farm characteristics strongly suggests an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pistant.ru/uplcv?utm_term=silly+love+songs+1976 PDF link annotation
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4646c0888---koxuk.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/63822431791.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/80878729842.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec3edbb5435---94764198640.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/91357996928.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a11857c3a9d---67757051210.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608954dd1e2e7---wopawowiv.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/selawosodalofenuso.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ededc6bad69---popesewesegizugonukage.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/nufuliludaxirakov.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/74022441796.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f53aa9254---budurigevaza.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa454c43f2---5657029053.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/lesofoxefajotigavuj.pdfIn PDF document text
    • http://anjilh.com/uploadfile/file///2021043014184233.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16079633c2f856---vazopazurazeku.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/4j7hhirlnertpcdvs54g39m81j/76385888840.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/fidudulapegobofaxiwises.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/tugim.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608612999e7ad---sorerexokudupolinunuti.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/direlab.pdfIn PDF document text
    • https://derey.nl/app/webroot/files/userfiles/files/99234622675.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/fididonizimopodonazala.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/17893585006.pdfIn PDF document text
    • 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
stream_006_off00010b2a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10B2A 10616 bytes
SHA-256: cda0c3b9c4adf29626e0dd39536ca0797ea662e717b03879f0af95d745e3fd3a
font_00_sfnt_off0000c4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDC 17676 bytes
SHA-256: ae32c634c9f7d5e2fe80e8cc82ab391f5014367f592b08a064c53eae9a772367

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