Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e6b8f5abf12c8f0…

MALICIOUS

PDF

109.3 KB Created: 2021-06-27 22:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1570e83238299292c39d40efc5e0bf82 SHA-1: d543b685e0143eee53834e266914b2d8ae5c913a SHA-256: 6e6b8f5abf12c8f02cd2597a20acbaf1814d2df30e5ed51feb72300848467cd6
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. The 'SE_INVOICE_LURE' heuristic further supports the interpretation that the document is designed to trick the user into clicking a malicious link, likely to download a second-stage payload or redirect to a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

Heuristics 8

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://liur-krd.ru/userfiles/file/30542518596.pdf In PDF document text
    • https://baxsporthorses.nl/userfiles/file/71839912035.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/93920846043.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/fotos.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff9dae46b9---silofuwi.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/titumipitepopudugataki.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/80629829951.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/aq2n7ghl59jeatfti9cl17lhm3/zowejoxomuf.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/92592054367.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084df764d2a8---gejizo.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/0e137fb286f4f0c914b3169606908237/pesofubemutagulad.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/a91f9ba313e7d703062f8228710c7d41/19223169646.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/fusobalilezo.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/70uqtuoqjokktm3rq2f5vtae9b/33348240811.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/thbhve5rq106n1k9t2tkpnu3s3/xusofusujugupebuzutapekan.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/c74d08fe8f9257489f434fa521a1f68c/xofujaluzud.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/worezetetejokazedol.pdfIn PDF document text
    • http://jfk1969nola.com/clients/873000/File/72595716702.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/0fc71a84f2c63e279300b4564980276e/89240274722.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/169fb8fd767dc131ef3424289a6ae4b2/4237426472.pdfIn PDF document text
    • https://faprosid.com/file/13842522759.pdfIn PDF document text
    • http://dzbnf.com/upload/file///sekaxuzetimodipojivuxanoz.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853bccd6d4c---33499754194.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff7114f459---66367854925.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/73846934595.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606eaddc42c5f---zogirabuwezugiveguzid.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a082d2e892d---vivugaji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=most+common+synonyms+and+antonyms+pdfPDF 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_off0001481f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1481F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16036 10520 bytes
SHA-256: 3a7a05d48dc0ab3d8c192d004028a37a8d11459c5549dbe240dd65ae15024713
font_02_sfnt_off00017837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17837 17480 bytes
SHA-256: accd137988f8578a7fa7a4b600953b9d75ccb943c553300ad4844d2f25769425

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