Malicious PDF — malware analysis report

Static analysis result for SHA-256 83af6c856f070d9a…

MALICIOUS

PDF

87.1 KB Created: 2021-06-29 01:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6757bfb6792407c7cb8352f4d668a020 SHA-1: c53eabc1805ecb8425dd1e1c3a20f1b671661472 SHA-256: 83af6c856f070d9a56d0ed2156cffe169d19795588a0f321a8280b9a54b0699a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The presence of a 'download button' heuristic further supports the intent to trick the user into downloading a malicious file. ClamAV detection and ML classification confirm the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/uplcv?utm_term=manually+remove+flash+player PDF link annotation
    • http://hoaisonland.vn/upload/files/fejizuw.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c6fe89dbb---wofajedudosinu.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210603083619124.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/67310423038.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607587ec3ec77---rapejotiputezosonuj.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d95126651---lakizezunemapexubegimu.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bdcbbe44878---bupimarorogor.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/23358610896.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607247432303c---lexovoj.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/22758779088.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c65e7858129---rexugulenudetebol.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0535818001621213084.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/52082472209.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16094ca54b00cf---sulijotabowemukedubazez.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/5pse4gg8mvdhkbl30pbh6bo1l2/radawowosidu.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/31924997815.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/28831623466.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160be5b7120218---fedoxoz.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160becc3a1207d---zidexefobalodavuzi.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/86751261634.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95d0217c41---49767773081.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3dc959f80---17346868718.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/nilasejafa.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/d551740171b2d08ce1c667c723257669/93699549841.pdfIn PDF document text
    • http://faxik.ru/ckfinder/userfiles/files/36018176794.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/tifijidiwovibejisedozulot.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b31c2b1af91---titizerawa.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
font_00_sfnt_off0000f0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C5 10704 bytes
SHA-256: 854f3c35740ba5f8da0e13f867430a816e5daef3502d5436c25b6af35c90e53e
font_02_sfnt_off00012136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12136 17332 bytes
SHA-256: e615b2cbe6367b53ac467afbd1871b45561a209c9ed8958c375797df9027012a

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