Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d0749ace2172646…

MALICIOUS

PDF

89.1 KB Created: 2021-08-05 05:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 491aa54674f224d335ecd028256738e6 SHA-1: 607072982a8f2bba8571162786472acc5eef2002 SHA-256: 1d0749ace21726460b6ad5fbc5e5b2961b60cdccdda221c1f1871950803947ee
156 Risk Score

Malware Insights

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

The PDF 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 compromised or disposable hosting sites. The embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://studioguatta.it/userfiles/files/mutimevupo.pdf In PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/pllk5j5gh0vklcuk1hr5pri22o/46086801844.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a099a78e034---94049341420.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/jisel.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/nizupa.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/39740142975.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/f1b5f97566086d348db88a3d4c0d92f6/62364822331.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609f575365285---81577196814.pdfIn PDF document text
    • https://tsegypt.com/file/23955695716.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/xanalakafomexa.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a7182a463e9---43930313636.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/qp69k01vq2iiko033pl1b42jb6/kowumububugaboteludul.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/89088956524.pdfIn PDF document text
    • http://lulanjina.net/upload/files/29423902092.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/ssi97ok6lfqk3fa26ch0fh326a/73850316524.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/me98u1hnripjm27gnkn4jerfgt/jejifitikatoritara.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/82864456943.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/rup3n0d5vug8uqd4mfe8ddhof8/8627913240.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210718_8EF66021E2A8460F.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/263nu93ihcg7boac1ki9rvjrb4/ximinigewifapulabejofutis.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd8f495253---37521060255.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/a8791f63309461b99199de91a6d5b857/bemewunisuzapokorolido.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee8ca0640c3---xuweximorenawigavanujok.pdfIn PDF document text
    • https://hoalavender.net/upload/files/jesovuta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+starbucks+promote+their+productsPDF 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_off0000f817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF817 16876 bytes
SHA-256: b9647fb3a307958c7e91768873e43c3f9eb582da1b8ed29f1c296e3a772a71d1
font_01_sfnt_off000123d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D3 11036 bytes
SHA-256: b4b90339d6b091c10bcd852fed49a25c48d546847c4d848ff528a0b78d077ee5
font_02_sfnt_off00013d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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