Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eb3ef14c199587a…

MALICIOUS

PDF

101.3 KB Created: 2021-07-05 18:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 174018655a12adcbf3d7a6d297efa7a0 SHA-1: 4741974846f1aa6b7a1a07627a3735d8d44d8fba SHA-256: 5eb3ef14c199587af3eb8495a1dc7945d192a55d3cdba861f4d62df3f2e49fb4
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It functions as a link farm, containing numerous URLs that point to various websites, many of which appear to be compromised WordPress installations. The presence of these links suggests an intent to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9711

Heuristics 6

  • 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.
  • 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://avenue102.com/uploads/file/60483573694.pdf In PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb140600e3---71261524661.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/gv214uq2l0e8h8i0iddfr0k895/xanuxupovudupov.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083362aae5fc---nitufusuxutajumatizug.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e8530926d---buxizuputuruxoluw.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-8/20210608041925442820.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/qe76m6ra48pdqpgjemqphhgqo2/63524274868.pdfIn PDF document text
    • https://peterdegendt.be/file/87534170704.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/54e8b6ffdbcbb124dc5c14d78be9b3cf/1472110083.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca8c65de26---galejegirudugumekun.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/e4cd08bb7fa824b5152b77371d0bd8b1/xotabopamaxa.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/sebomewonimotepo.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/phectnn6fb0ef10es65koev7e7/88264303962.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608014a0dfbbf---56600303703.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16094a8312640e---68758564193.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730510e42b2---72847075083.pdfIn PDF document text
    • http://blueyee.com/upload/file/311118241870.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fef150cda8---sevatiteridekogab.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/fc1aaad17ef889722d5a7ea9634be82c/8686175870.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083e28bcd570---jakobagasejiniguloji.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/kfh6ufj3ssui451jkmuskm4apa/lufowugerarenojofabuf.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aab7914ead---gosabo.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3eada03cf---velowonar.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a537782f836---63915349081.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+make+ice+doodle+godPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEB 10508 bytes
SHA-256: f05eea847770b030558bf4e7043bfb444a50eb1a3c15724f3916c7f4ab9801d5
font_01_sfnt_off000113a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A6 16252 bytes
SHA-256: bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
font_02_sfnt_off00012986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12986 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14198 22380 bytes
SHA-256: cd2cfe6d81ecec1c769601ca684f5a245488c49a107642819f5e3a2871ac1680
font_04_sfnt_off00017a25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A25 3180 bytes
SHA-256: ec3fdc3d117433e810cbcd9fc9dff5e46fc6877546bb5e190270e702161b6bc2

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