Malicious PDF — malware analysis report

Static analysis result for SHA-256 b074b3a86e186d0d…

MALICIOUS

PDF

92.2 KB Created: 2021-09-07 08:25:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5cfec5dd0123b02abc99e405f41e4b1a SHA-1: 72150ae47e23207d9a13dd57b6461258e4c99477 SHA-256: b074b3a86e186d0dedde4ee87d89b94286a6c3b5b7ca89971c441bf2e103e6ff
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous unknown URLs, some hosted on compromised CMS uploads, strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://rajatotogroup1.com/contents//files/xikefulug.pdf In PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/gemizor.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/61771118164.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/5677b1e8c77ab5068150c401cfad5b69/diwinolenabovulugudo.pdfIn PDF document text
    • https://newoptic.mn/uploads/files/20486058480.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/pezijasafi.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/wexoninalinilume.pdfIn PDF document text
    • http://master-br.ru/img/file/fikujerororufovo.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/gemux.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/likekipetew.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/gabegagexitizubazo.pdfIn PDF document text
    • http://micruts.org/userfiles/file/77833131648.pdfIn PDF document text
    • https://masihpt1.com/contents/files/verut.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b82c862f1a---fanowawusunerudelisirasug.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/64168736408.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210625031051351.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/43491288418.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/gisovewugunirobajalala.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/08082404790cfc7ad2b2f66a963a116a/68015482825.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/67866950203.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d928c9bf23---kenosugeroxikoxepuwipiret.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/82346618969.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/77051799443.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/amueunu4skh5s7s1u0ffe6l7na/kinodipupugesedo.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ef4fe89d6---movijowoter.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/1c1lrrdhmjrl61p0giuak6iohq/dugipefot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=comment+rebobiner+un+moteur+electrique+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_off0000fc14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11426 21308 bytes
SHA-256: 340da82b82cbd9008bc5f4158932a689be8a5c5ce583d06135c53c8760e4e989
font_02_sfnt_off000149f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149F8 10868 bytes
SHA-256: 79e0b9bb7fa19d09f06dacecc4d2a31697cc86e73c4021fdacbe56a6e5f16189

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