Malicious PDF — malware analysis report

Static analysis result for SHA-256 1de983f11135bf03…

MALICIOUS

PDF

81.0 KB Created: 2021-09-13 00:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: da23ffe68799e33b7af6c61f7f0ec576 SHA-1: 4457fb5f8bdc7523eac885901fa643c4e9401bad SHA-256: 1de983f11135bf03df7104e01ebf4182abf6b07017a6985c5613f477efcc9676
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. The heuristic 'SE_CALLBACK_LURE' indicates the document's content is designed to trick users into calling a phone number, a common tactic in tech-support scams and phishing. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest a phishing attack pattern, likely involving the download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://queure.ru/uplcv?utm_term=guess+their+answer+mod+apk PDF link annotation
    • http://vako.vn/app/webroot/uploads/files/81382302892.pdfIn PDF document text
    • http://cocoal.com/uploads/file/64283688516.pdfIn PDF document text
    • http://khonggianxua.samdigroup.vn/app/webroot/upload/files/fitemoxenu.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/36281022697.pdfIn PDF document text
    • https://rinducm1.com/contents/files/famugokivediluwut.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/xitamulegemojujazuval.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/bezoxa.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/15170830826.pdfIn PDF document text
    • https://svltv.in/userfiles/files/kesodufara.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/80591409535.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/nixemavinawe.pdfIn PDF document text
    • http://355353.ru/userfiles/file/79866412821.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/sesazifu.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/53717341350.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/losaroxemujamazeroromebaw.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/31978621874.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329134e3752---kudure.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/gajerusidefoxobupomaxad.pdfIn PDF document text
    • http://katachizu.com/img/news/files/31190352964.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161326964028dc---30524169929.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/lawewogafal.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef5bde914a---suzemunevosijemetibowaji.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/iua139lsbgm6u60ht0b0ftsojj/relijofenadofidofegupopen.pdfIn PDF document text
    • http://philboyd.com/redawogavunewagupikugisa.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109101823472803.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/91490886020.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_off0000d53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53D 18540 bytes
SHA-256: add994e31de1913ed3f2f292231483309b0e610b31c787dcdd4408c180257d9e
font_01_sfnt_off00010559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10559 10928 bytes
SHA-256: f904d6ffdc6f93b84ce11daf1ab7884b4c892cadc686f954b3ae714fa1651bff
font_02_sfnt_off00011e91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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