Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ab615de0eeb58ba…

MALICIOUS

PDF

83.6 KB Created: 2021-09-08 09:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ad41b103fa88a747144adc6d253eb5cd SHA-1: 38f11e04971c5471358b1713c6d99b36b7fdd709 SHA-256: 0ab615de0eeb58bab025bb01539aff6c9da1a171bf946f4fdc1f160d6ea032a1
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised WordPress sites and other disposable hosting, likely serving as a distribution point for further malicious content. The document body is unreadable, but the heuristic findings strongly indicate a phishing or malware distribution attempt.

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://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/21f3302093d4a6ef01d89f27ac4bca13/sazibip.pdf In PDF document text
    • http://hatowo.com/app/webroot/uploads/files/botekimolufate.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16102ce30ea132---4820404240.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/4202117129.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/68294996822.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/bc6d5f56f2338ead5eb6915749a4dec5/92551681606.pdfIn PDF document text
    • http://vietdubai.com/userfiles/file/kukonevaguna.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/vukidudowat.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/e5a514fdad7798843cbd7144cfed2c7c/69210272610.pdfIn PDF document text
    • http://ri-rm.ru/userfiles/file/59844631874.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/9fb7cdd5f96a239799cbfbecaaa476ed/23066145960.pdfIn PDF document text
    • http://selidbe-beograd.info/files/vulufoxosinazadarol.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/35328249061.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160978348e86cb---sopebe.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210814_1801A060C425E548.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/87414608213.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/9a07467c8d8b16326d68153aca254b1c/tusodi.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/tofadajivuzogeme.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92e7e4d36d---48490007501.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da13fc65fc---56648027066.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/e49b0c75c296aac23ec4400d57c56728/rijefinujafetekepitison.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16090f26b71f6b---92919101136.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/22487062365.pdfIn PDF document text
    • https://www.espaciocultivarte.com/ckfinder/userfiles/files/turogawuwevimas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=exercices+masculin+feminin+ce1+pdfPDF 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_off0000dade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADE 20440 bytes
SHA-256: 98f8cd5576b0eb244b08095f786a7c2bdea44a0972cd991ab06330373c66e362
font_01_sfnt_off00010dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EE 10800 bytes
SHA-256: f709f7b63f203534f9a04f7ebdf22356e316888060ed0ffa11c05b81ba22fa6d

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