Malicious PDF — malware analysis report

Static analysis result for SHA-256 95dde2ab03bea1b4…

MALICIOUS

PDF

80.5 KB Created: 2021-09-17 17:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 5c3e32d5130a1dddf5d51a86b4be18b3 SHA-1: 251dd7c5d9ffc45fde627a4b78ddf1fccddce820 SHA-256: 95dde2ab03bea1b46fc7e3b575ba14ed82bcee3612c66d961d28035db3d2524e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with ClamAV detection as Pdf.Phishing.Trojan, strongly suggests a phishing or malware distribution attempt. The embedded URLs likely serve as lures to download further malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://crysiq.ru/uplcv?utm_term=how+to+set+up+speech+to+text+on+android PDF link annotation
    • https://evrenmentese.com/upload/ckfinder/files/pubogederiken.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/loralomoxorepi.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/78430717453.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/52521987278.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16136cdfb65fe6---zoxotetimufekejodadotaf.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/kusujupegokijodiforiso.pdfIn PDF document text
    • http://winso.tw/userfiles/file/sabomuxoxesutesezuzexag.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/wibisonofe.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf3463788e---pusekawopajumefo.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/fizowinux.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/tefar.pdfIn PDF document text
    • http://yejiya.com/userfiles/file/vewopiguzimefunakedokeri.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a5f58556b---xofasedimakeneselirite.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/gifiteburadez.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/15174069505.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/nujujenasapoperexitixip.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/sekemepamobugope.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210906_160343.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/64318316060.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/46149802256.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/pitinevalasubupidubeve.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/lg6gd107un82o13bo0tr025fia/kinatumoj.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/rabidusodus.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b3b6597a5---39767840372.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_off0000d67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE91 17196 bytes
SHA-256: 08c185be95ceaa33694ea404cb976159761083c5c6887e80342a0d6462af332f
font_02_sfnt_off00011ae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE2 10844 bytes
SHA-256: c45813055875c6f78c75a08fcc65df0f4d9f9b516e8c6574fe5c773c4f446329

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