Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a374da606e3255e…

MALICIOUS

PDF

85.1 KB Created: 2021-09-02 02:24:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 295604ea5b2331b11a4c3f9e2a63319c SHA-1: c461879560dbe74f053d5e0fd20ed835d09ae423 SHA-256: 3a374da606e3255e486b4d65e77c65a5ddc115aa6533003c8dd6c9fe2baac754
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to manipulate search engine results or distribute further malicious content. ClamAV and ML classifiers confirm its malicious nature, specifically flagging it as a phishing trojan. No scripts were extracted, and the document body was unreadable, but the heuristic findings strongly suggest a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/22c4b30e0e21f5a89e641396cada186c/93698621203.pdf In PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d5f2fdde684---bomugafudegumuzulofupe.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/c6b97a8867f749385755a04178defefe/22458797530.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/77731898416.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/veluwupolapufusutevuvowi.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/99ef0482d265ab38ae06854816a69f54/5129338744.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/9ac52c6c4f25b638a0048ae3c82339b6/putafipinaregasezedudedul.pdfIn PDF document text
    • https://lymfologi.se/anvandarbilder/221/files/50863453059.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/zanur.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/743e19fc148207d887d4d163882b5c3c/xewanerevuzi.pdfIn PDF document text
    • http://myphamso1.net/uploads/files/59892243731.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68725524829.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/kodavasafawanuseta.pdfIn PDF document text
    • http://nslogisticservice.com/userfiles/files/bovewizejerose.pdfIn PDF document text
    • https://0900107678.com/upload/file/davifikubodim.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/zinizozopor.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/40477821444.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/4e9957fb8672611ff7417f86e3e12578/3533917969.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609452059054d---81313574062.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/35288145388.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/21162988131043c9498ac3c9b1a7bd8a/20427631959.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/a93b62fc8ab6a65629113a1f45eb84e9/87196471259.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609639664b4da---ribimumorataluvoza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=food+related+vocabularyPDF 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_off0000e633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE633 18812 bytes
SHA-256: f2a98cca461723471b33e10e26c157c61660b5e5bc2cb11c287606bcffbb873b
font_01_sfnt_off00011641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11641 10396 bytes
SHA-256: 757cbc13d2a495a5d87bd16edaaf86e4fb87ffaa242cd89cac2427dd96a98a23
font_02_sfnt_off00012dee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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