Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5f21465f3770ba7…

MALICIOUS

PDF

85.2 KB Created: 2021-09-02 17:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9fc7fc0d8c9eadf8066c024fd16df44d SHA-1: 6cf619cdbe91931973553330f1116aed82aed410 SHA-256: e5f21465f3770ba71a83bb608c35f62f1ed5c264633981cf5c0232da2f2eb2bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high probability of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting or compromised CMS uploads, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly supports this conclusion. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://infrive.ru/uplcv?utm_term=mitsubishi+user+manual+pdf PDF link annotation
    • http://splogservice.ru/content/file/68682904887.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///79686970059.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/60239533287.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/79940439489.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bef59943663---99798653300.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/tatonupigit.pdfIn PDF document text
    • https://paperland.bg/uploads/file/kuxomakuboromumaxugiru.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/fbvv75ffmuvp4b2v79gk9shi48/12653262035.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff0f9030a7---nevisurugog.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123c7e2ebb0e---37932746020.pdfIn PDF document text
    • http://emannsltd.com/userfiles/20292499259.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4cf31d91c---tofejelarodomugi.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/repagosuz.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608094105fef5---viderogosuka.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/23340248202.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/baradoga.pdfIn PDF document text
    • http://gapp.fr/medias/files/92947774799.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cf27641ff90---60754143388.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/nefoxapudozi.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/0cc633dc8ec018ba8b0c7e417a25be74/77628534645.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/20350834015.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/3a507e08b4871bbc75cb137152546305/vinowo.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/5oevrt56cipbs0im9hm90bbid7/90143381380.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c005a04ff98---27842390750.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/32949040043.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_off0000e7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B7 10876 bytes
SHA-256: 1a876998f3b9614b60490dd5ac38d8afcfa0ff4ca732daec12809255d6f8b814
font_01_sfnt_off00010071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10071 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11883 17888 bytes
SHA-256: af5217ec7b45f264b54f48a052f41b3b2d82dc18ed73e86a51f0e3b3fcb7db23

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