Malicious PDF — malware analysis report

Static analysis result for SHA-256 be70fa5ab88b53c1…

MALICIOUS

PDF

86.0 KB Created: 2021-08-30 22:24:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a3aa8be54661419dd08802acb138ed31 SHA-1: 6691311a48481a2bcb07e76b78fc3fbb21d10028 SHA-256: be70fa5ab88b53c1ac1d3bc09e185b7674ea46d16c33236e42dacb4e247231b1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress uploads or disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

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://alatheir.com/atheirwsfiles/file/mewepinewoburiba.pdf In PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/nosevidare.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/bisixixavumegodaw.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/kirobowavawigufugisapo.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/61590247521.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210828022439.pdfIn PDF document text
    • https://felicityokolo.com/file/73008211537.pdfIn PDF document text
    • http://lucann.com/Upload/file/63026673681.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/zozederezek.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/bijilukup.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/77110340407.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c09482130c7---levobijajutepegisuxo.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/nukubefukijofuzedi.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9da75e3d8---44531916535.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4cfaab0fef---67584561072.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/19451821164.pdfIn PDF document text
    • http://stl-hk.net/userfiles/63419440973.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/37244cc8d352081c91044e7f9ac7455b/tazaresopuzu.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/9485442340.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/34347837715.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b41668191ad---pukososupedu.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/zexiwemuvofudetejox.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1189ba644d---66854323876.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/82349032307.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=what%27s+the+best+steak+to+eatPDF 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_off0000ea44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10256 18528 bytes
SHA-256: a74b2a3e42ff8612b817f8f3d59797e7f96606ea61e887d494317d1712784131
font_02_sfnt_off000131e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E4 10124 bytes
SHA-256: ada37bfd8e9b82b4e04ac75a68a90a09482f11a3d3c92982f4a62e1e44e9b78e

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