Malicious PDF — malware analysis report

Static analysis result for SHA-256 5165f83340a35793…

MALICIOUS

PDF

76.7 KB Created: 2021-09-10 10:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8c3b4f2310fb41bd077fade451fc2e19 SHA-1: fd31f5c3630d48a95c98da9700ba8c29e79b82e3 SHA-256: 5165f83340a357938747975ef3d4ea94ee0e021290263f0f5b531216878b84cc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites acting as a link farm. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, consistent with phishing or tech-support scams. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://allytemp.ru/uplcv?utm_term=good+night+my+love+quote PDF link annotation
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613750cf23ef5---44484819257.pdfIn PDF document text
    • https://kimansion.com/uploads/file/66924535420.pdfIn PDF document text
    • http://hnht-electromagnet.com/d/files/ninipusavojabejivopiligi.pdfIn PDF document text
    • http://sun-eko.eu/files/file/37022687446.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/20162952664.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcfa0a2652---97531619567.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/6117705447.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/xaxexidapikakitaw.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/84661841145.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/1192515646.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/42419311202.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/puvilejuwuvazavazomarev.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613851c387eb2---53375974459.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29694119378.pdfIn PDF document text
    • http://ymmicro.com/files/files/37368835245.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/161306c0959d47---10680016999.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/50565963760.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/setivazonazupipejumimub.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/66796060709.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/81053762989.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/11749186422.pdfIn PDF document text
    • https://auto826.com/uploads/files/luniruvowo.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/nurami.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/dagodamoze.pdfIn PDF document text
    • https://greenways.at/userfiles/file/malutaxafu.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_off0000c972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC972 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE189 10728 bytes
SHA-256: dbc5a4ccb73b18bdfcb14c57f26ee8d3ab65f2fa9f3047512c751c27f7cf61d0
font_02_sfnt_off0000f976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF976 16996 bytes
SHA-256: 35098d3a3b63d4fd558498a07b7527b667f18e47eb37abc589e5f9a04e080099

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