Malicious PDF — malware analysis report

Static analysis result for SHA-256 b051785ff6edac55…

MALICIOUS

PDF

67.4 KB Created: 2021-09-03 08:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8472433e02db2e6e6b2dd6f715842cf6 SHA-1: da9da72554617d86a9737f64d9ae59e94970b3e4 SHA-256: b051785ff6edac551971d1fbfcd1fb280532a0cfb17ace35f84ad59cd5a85e26
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file exhibits characteristics of a phishing lure, including an image-only document with clickable actions and a link farm pointing to external URLs. Embedded JavaScript was detected, suggesting potential malicious scripting capabilities. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sacc-la-chaux-de-fonds.ch/fichiers/file/78376370969.pdf In PDF document text
    • http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/51991562223.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/99127335834.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/kunedaropifibapus.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/3008471784.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160890bf6d280c---zosoraniwibilelejaz.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/91690813019.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/59543941272.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/0b3e99934871b191e24a4b79dda8f20a/30201579061.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021062520483239.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba49e3d270b---bodipesurosawepat.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/nofokifegedofifili.pdfIn PDF document text
    • https://www.carrentchiengmai.com/files/xuvaluwafiwomapat.pdfIn PDF document text
    • http://scantech3d.com/files/96892777716.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/gepelevaka.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609456cb6500e---55932310104.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/mudesomusotibupexisixo.pdfIn PDF document text
    • http://synersys.fr/contenu/file/dabezineroxir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=les+propositions+subordonn%C3%A9es+circonstancielles+de+temps+pdfPDF link annotation
    • https://mediacentre.aerlingus.com/js/ckfinder/userfiles/files/wogokavowafev.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_off0000aab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAAB9 11132 bytes
SHA-256: 9c225c4f918c13881bcff880a3c8370c273eb699911f836460104d5c325f4dda
font_01_sfnt_off0000c425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC425 13716 bytes
SHA-256: 0be62f6d0b7d246b684b78cb06f56861699418f668da9d9e1055b7c035bc9e48
font_02_sfnt_off0000e57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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