Malicious PDF — malware analysis report

Static analysis result for SHA-256 8802a0860b7d1fc4…

MALICIOUS

PDF

72.2 KB Created: 2021-09-13 16:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fe77869722e1d3c0cbf6c3ffea81e315 SHA-1: f349f2892809de7c427b3c5e5097c13c1658fa28 SHA-256: 8802a0860b7d1fc492c007a79cfe369573285ff7175afb856d3436b5ddb95050
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138553e15d38---82862180001.pdf In PDF document text
    • http://imhome-listings.com/userfiles/files/gokijadadawud.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/qa6gbisou6qffd2dnm4db745qc/nivuzokijebobakufobabojaj.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210903_27990E9F28CE83B8.pdfIn PDF document text
    • https://olterus.com/contents/files/80160992703.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/sererafasafuxolojeg.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/57951280190.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/35548655339.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613169f2136d3---resemewotigunapu.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/75994963207.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/vurilibezutawekemobuguvo.pdfIn PDF document text
    • http://dfanchem.com/upload/files/rabufojag.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/maboxir.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///xobinoni.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0f45801e0---43821809694.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/4360886520.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/41804439590.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/62994056072.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/nozopoguv.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/pedifudivipegadoroseja.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/35074712247.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/jebinakuruwupekalaran.pdfIn PDF document text
    • http://sro52.ru/uploads/files/36801013202.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=mega+mod+appPDF 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_off0000ba71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD288 10120 bytes
SHA-256: 6d1e96bab7b90805b03fcea3d334d0787776f8cae02c46284500841c3f30c108
font_02_sfnt_off0000e8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E2 16696 bytes
SHA-256: 1e631b155d0d0d339865e65d24c259cfcf64fafa4b7d7cf9dd3633fe2090895a

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