Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9c2f775f1e99513…

MALICIOUS

PDF

71.7 KB Created: 2021-09-01 20:31:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 473beaa38f8bed757e3e6549592359ac SHA-1: 9fba8c933ec1d3fc26781efe7e8ad749fa3fa95c SHA-256: b9c2f775f1e99513c45f7a60ba1db2664f12c4df1d2a71a875012a4ba64e9986
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised CMS upload storage, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • 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://smidgel.ru/uplcv?utm_term=cpu+fetch+execute+cycle PDF link annotation
    • http://perfekttorun.pl/pliki/vuzukebiritekokozejibuni.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/galuvelib.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202108132227197076.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/babilexu.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/rewasigekutajuvopazeke.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/55154010770.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/gexowesuboforavuveref.pdfIn PDF document text
    • http://abwva.com/uploads/files/77211773444.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/34504152425.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/70cc1662990796c1e9c09b3ed107188d/13406237028.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/45685884451.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/10580124297.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/valebima.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/34354283258.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/28684010024.pdfIn PDF document text
    • https://discoverthesky.it/file/27024694181.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/64763088091.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160af29b7db9d7---17973231861.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/848025697e10aa22dc2a5b8314a8bdad/56887643414.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/62326223612.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/35617059192.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c09732b17b6---fozanabafirilumujunabom.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/vetimojunodita.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_off0000b987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB987 15952 bytes
SHA-256: ac11ec749812e99b335e6c8b5178995799e345b8065e5ab9ad9fec4918b64e3d
font_01_sfnt_off0000e217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE217 10176 bytes
SHA-256: 4e01e1cb13d14e2f21fd81cd8bd5835b4d0e8b495d090107b2771519d0bd38de
font_02_sfnt_off0000f91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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