Malicious PDF — malware analysis report

Static analysis result for SHA-256 58e06ac2869ff390…

MALICIOUS

PDF

81.4 KB Created: 2021-09-18 14:14:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9d49c3a84f98ddddf4ed987826e581a8 SHA-1: ee00261b332dd49fc555f41c5422c4559739e8a1 SHA-256: 58e06ac2869ff390ccac93402105b94d0d437876a42428c9509f35b54d4a0920
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, with several heuristics indicating it functions as a link farm hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://zartmobilia.com/userfiles/file/20210902043634.pdf In PDF document text
    • https://euchebnici.com/img/file/28279764205.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/92409086482.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/niwitu.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/98293666782.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/94456299041.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/wolumofu.pdfIn PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/todonoworogekinedabomajo.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/lidovukedavotivokigipa.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2f1545341---45424915383.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/bbc20f2af684480a5b99d02f57c29220/sisewewemaxeku.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132475b6695a---tujatikokopigaju.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/jobizigerobaridigev.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/vaxewafovasutuvoxewapoma.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/nadun.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/86968267295.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/sqvncqa7b81gr60lmo1nm5l7o8/7150599944.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/66143648509.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613945101049c---xogelanaravazuvapib.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/gevatawejevuredukoge.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/gerugodiborawab.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/vosus.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16134c5324888c---sisikukalusasaxupukela.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141a6ed90120---mopageponom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=poweramp+full+apk+gratisPDF 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_off0000d50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED20 19148 bytes
SHA-256: 466589d1538b85beeb006ccc059c3072f3a1fffe1771c77ea33ba4460b666cec
font_02_sfnt_off00011f0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0A 10876 bytes
SHA-256: e5807ae2785b1430d5d176cf78cd2358d55e1bb3c8f14f5af365f87a17dc5f47

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