Malicious PDF — malware analysis report

Static analysis result for SHA-256 1013c3986780e896…

MALICIOUS

PDF

85.5 KB Created: 2021-09-10 00:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f58763a6e0a03803dc76d644df476b90 SHA-1: b89227330b0960fe4f10eefded70b75196481f0a SHA-256: 1013c3986780e89614cbb32e13014b60be3f0d5996598ff8ad8eb16a24105c25
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of a link farm pointing to multiple distinct hosts, some of which appear to be compromised CMS uploads, further indicates a malicious intent to distribute or host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maraulsan.com/ckfinder/userfiles/files/gexafidilomawemiduzasewot.pdf In PDF document text
    • https://lajovisena.com/gallery/file/majakasevawizusixab.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/39101276254.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fac08e615---vogulezidazamilugov.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/rinoroju.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/16571591487.pdfIn PDF document text
    • https://irrisyst.eu/files/file/sameza.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/bagete.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/89378803196.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/73367507967.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/13375176355.pdfIn PDF document text
    • http://itena.si/uporabnik/file/64198443430.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/dinugulalowuligexup.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139060998893---nezidarabaf.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/29298640516.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/161302fbc4dd5a---nezizegow.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7909c2769---nizapemopovadoli.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/93354561252.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/tepujitiv.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/guvikeponiroj.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137506cb12de---11600376125.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210908011004612.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/55970013191.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/mivikaxekopesijorilojizi.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/xitebajadapazoda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=logo+making+app+for+androidPDF 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_off0000e9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A3 18056 bytes
SHA-256: 01f3515186f643dfa0f67fd0eda57bbe3f0d22a1e9bbf390f42df76c43d2e01f
font_01_sfnt_off00011884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11884 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001309b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1309B 10448 bytes
SHA-256: e69617b79e02ecd4190be27ce5fa4eb49f9bf3c51239b5dcce3eb6ae2b10b7c3

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