Malicious PDF — malware analysis report

Static analysis result for SHA-256 66af071133b36a81…

MALICIOUS

PDF

81.1 KB Created: 2021-09-19 06:15:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 742a6ec8493e826c23ac124cc917bd4f SHA-1: 7346da263a887f2ec3cd3e19fce4519db3720525 SHA-256: 66af071133b36a81fdb67a70b86e097dd040e4ae7e25ae969dbde164493145d5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of a link farm pointing to compromised WordPress uploads further indicates a malicious intent, likely for phishing or malware distribution. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba5f2c6e9a---96401909171.pdf In PDF document text
    • https://lazerom.pro/media/file/zoxulemubemojafiriguza.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/mugozovewojogazorilodotof.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d5b52fc3f---23828312666.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/45921318279.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/41793718300.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/39472236.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/989153285.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/3829258347.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/36312784967.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/gurexexube.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/vubelesugaxemewopejenili.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/54029371600.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/gupuromeveguduvagoduzuvum.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/lisabakapifa.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090201531273499.pdfIn PDF document text
    • http://geose.ru/userfiles/file/satujadidegudikitipetapa.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a414b4c8e2---23756647763.pdfIn PDF document text
    • http://tid.vn/upload/files/41540053099.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0477c87fc---90657456597.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1631329986.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/zafesapumop.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/nigukekiwovaxezafiki.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613278dc06268---62770489285.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=android+read+text+messages+through+car+bluetoothPDF 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_off0000d711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD711 18044 bytes
SHA-256: c38e9d849b61c5ab275f0ff7da93d18131beccb35fbcf4b7b0b6719b7697842e
font_01_sfnt_off00010500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10500 11140 bytes
SHA-256: cecaaa39e6482cd866aea7b3705fa770530f0e69dd17759bf82a333728f37f83
font_02_sfnt_off00011ea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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