Malicious PDF — malware analysis report

Static analysis result for SHA-256 a80f38d2e595a0ad…

MALICIOUS

PDF

69.3 KB Created: 2021-09-24 20:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1c582a35cb20df83bdac3a9b9a729faa SHA-1: 0ab2e453630654083552709ac0424ced81697a0b SHA-256: a80f38d2e595a0ad63d560e79df47f96bbf29d25e38334f080137d10fd11fcb1
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URLs, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the overall structure strongly indicate an attempt to lure users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://oniceh.ru/uplcv?utm_term=free+primogems+redeem+code PDF link annotation
    • https://my-natural-style.net/upload/files/lijitowosu.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/mekajezabunutiwavofugosi.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/fediwuzegerib.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16144e5065a95e---19083370870.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/fidaz.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/digebopiwuwosogipapadi.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/baxurirofaful.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/tuzefisoxawozivubam.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/86760391915.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/65995924128.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcf15e2a87---sugos.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/mubefoxotuzixemibi.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/tubexategosotajopizopi.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/zumeboxis.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/resulujagepubuv.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/97940481719.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/piturezejikunoj.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16146c48ae3671---54872207732.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/vuzotevidewukatebak.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/83806483018.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/49891940899.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/e514c15df22b06e2619bec3748d60868/zezafizezutomuniputefudep.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/kimupipizipurukibuv.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/6142dcd282f3b.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_off0000b1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D6 15060 bytes
SHA-256: 023c5f48e40e05da58281d8b6f71d80bd5b0ca95eba620273754b3217b6d4d9f
font_02_sfnt_off0000f00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00A 10424 bytes
SHA-256: 92ef2fdc31b2bd97401835d73f12c379e6e8d0fd09e7a5696f07f68901de094b

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