Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6d83a7abee84720…

MALICIOUS

PDF

79.3 KB Created: 2021-07-06 23:16:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4f974281df7321d57ac075937630fb57 SHA-1: 0990aa0ade6f1c38d8106f1dfe65bdd4661400e2 SHA-256: d6d83a7abee8472047051900151a90b0f6b79109db9511d543d8166a2d24ad04
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. ClamAV and ML classifiers confirm its malicious nature, specifically flagging it as a phishing trojan. The embedded URLs, while some are marked benign, contribute to the overall deceptive nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/6eab4d59e1cd2a5c4b40fc484b53e2a5/62446951933.pdf In PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607006455968b---lanofizel.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/fedotasekumapuge.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/e289615fb4d28d78819fa162308c620f/nogavosimifez.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/06/file/202106260530583102.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160823790083db---vesuxexejutuke.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/9845379638.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cf67c80c2---pumopemotat.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f3e16f5ec---71672132553.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6c65c725---12603680780.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/jewulunelozobopudutuparo.pdfIn PDF document text
    • http://gptools.net/userfiles/file/51280169527.pdfIn PDF document text
    • http://yuha.be/_files/file/xarivixukawurowupazedobux.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/12a4m9nor2f1spumgapjb3dqa1/6537121976.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1606e44672c29c---33918083166.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/padetelojaduxikem.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0fa679bcb---kuronejifirebasemajavobeg.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/wajanobajojamagizirogis.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/wisimeluboxirodofejiwuras.pdfIn PDF document text
    • https://nevisnews.com/userfiles/jufowutilonalabemikokade.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bff3f2bb4b9---tuxutolusaduzutobonetigil.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608511aa040c3---73715744730.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c2e2407f7---39267857661.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/vamowalukutuziwebitada.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+connect+hbs+730+bluetooth+headsetPDF 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_off0000ce0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0F 18432 bytes
SHA-256: 6fc29f23c441c065403f12c25d1513b579b5bab2d4423631cfd71e51ed41b48d
font_01_sfnt_off0000fe93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AA 10936 bytes
SHA-256: 0578046d2e7ae2a33befb60439f66a8a772d1085a5952ffb9a79008a6800cbb4

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