Malicious PDF — malware analysis report

Static analysis result for SHA-256 79a944cc1558edb4…

MALICIOUS

PDF

81.7 KB Created: 2021-09-17 02:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0e29a793c94c2bf832f80b7830dabd54 SHA-1: 53435ec49c18e52263c58693cabdcbd9ed5cf7a9 SHA-256: 79a944cc1558edb4b8e2e0d51388a0ddfaef5134d05896d712eedebf0df348b5
176 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs and is identified as a link farm, with several pointing to compromised WordPress sites. The document also includes a heuristic for a QR code lure, suggesting it aims to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://infrive.ru/uplcv?utm_term=android+discord+voice+changer PDF link annotation
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/7159d9a9f647d6d5c4445ca831d242cd/79830626110.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/38360366798.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/61584454474.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384a3095d4a---56971854198.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/b6a24ad628e9eb71c91626095140730d/naguborefufosavizodopoko.pdfIn PDF document text
    • http://clerus.hu/files/file/kukivulazutokilereve.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109082248023906.pdfIn PDF document text
    • http://budka39.ru/files/67355176160.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/46661306417.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/panawefajax.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/lepokezaxav.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141cac3c9c3b---kumiwe.pdfIn PDF document text
    • http://itena.si/uporabnik/file/bedewevubiloxusozexofur.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/vijepawavikosawovepuk.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/30493338622.pdfIn PDF document text
    • http://freeorden.com/media/file/jigafurilu.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/43a842b5569c4a78459b071c5a6f8207/bulesilolokebamux.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614165f278f8c---dapege.pdfIn PDF document text
    • http://rem-proekt.com/f/file/pisabik.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/39249850175.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/didopenezolijuzurigujuju.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/najolidovusejaworof.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/12084130340.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/losawaditen.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/46598782716.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/9295bd8450251bcd4a5b368b8ec21675/vatiwefexixikex.pdfIn PDF document text
    • https://alpinashop.bg/files/bigiwazuwidedojoluzesat.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_off0000dc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF489 10552 bytes
SHA-256: abc54d7b4becf09f5aeb9294bec0d7e59295196c25df263ce22ab8f82b480608
font_02_sfnt_off00010c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C57 17100 bytes
SHA-256: af8c683279d217e1a468693e290845557e5edb286c39683777805ee1aa5cb6ba

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