Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7454f2f9245e1cc…

MALICIOUS

PDF

83.7 KB Created: 2021-06-27 00:03:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ca00fb558cfddf8126280de746093fa5 SHA-1: e0411619af8c462d1bf65518f1b29e09818bf619 SHA-256: a7454f2f9245e1cc314bcdcbff453431a7eaf6368265a56cd5532aa2390c57cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://chcial.ru/uplcv?utm_term=how+to+use+dryer+without+shrinking+clothes PDF link annotation
    • http://backkwang.com/userData/board/file/dinaxivipebamurudul.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/41f13e98eb382cdee3a30c8082127bdd/zenerumikiraren.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/zizunomatesik.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/binopinunerijudivudexuw.pdfIn PDF document text
    • http://edgecs.net/documents/78759339484.pdfIn PDF document text
    • http://indecomavo.pl/inc/12417793367.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/d055f6edb3e5f0f9f7bbb969c96df5f9/parovidesixedebopa.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/a6c7539edb4bda506d1234485413770e/mawemakonin.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbf3806e81---momasazadiku.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb094ba69d---52773133456.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160970db85cb56---demudibezutadi.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7374259bd---80456443997.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/88440742753.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/30558683666.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/58543065142.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/5337f942cf31ccdf3f8b41386ea76ba2/fuvejevomizajugonoge.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce02f1c0033.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/9c12e0cd3bc8c473f2b635fee579180f/bodak.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1277c1470---kemepeseputebupuponel.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/17043640746.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c19ee502c0---61406132372.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/vajapokilevurepopo.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/nemenamavowuzavelemol.pdfIn PDF document text
    • https://securityguardsupply.com/php/uploads/file/muxulibaxudavalanedutip.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/3d59366eb823d1d6f15514033f788b89/pirajudida.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_off0000e2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB09 17320 bytes
SHA-256: 4acc06893075d11c23bd86a165397f623258faa0cc31599115acc37c7aa68920
font_02_sfnt_off0001286c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286C 10868 bytes
SHA-256: daf6cf54fa3bfda40ac28272d3a9687ed48ce05061ad25e6ba0dc2c72a22d8d7

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