Malicious PDF — malware analysis report

Static analysis result for SHA-256 c87a847b529eac53…

MALICIOUS

PDF

70.4 KB Created: 2021-08-28 08:58:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 669f51b4911e9b255f01e89db3cf95fd SHA-1: 49f33b7a8a8d5c7696a516ad66a9fd834809e37a SHA-256: c87a847b529eac53a4f570bc9d049cbba5b4ae8eaef3587178ce9fb3e1a93a28
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute further malicious content or phish users. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/0190b06b716ff85127d1fca4d4fad578/telolaketokalobanidasap.pdf In PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/gugaradoxulox.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770e8d7a32f---39955617105.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c3698b5d42d---40263387894.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/48215401908.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/97488470098.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160ba98722ee25---50284887616.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dca1365f428---89499031217.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fb9e81197d1---28858035179.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/nalivinubanemokezurod.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16070e407c2b2f---44143203760.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/6ev2d3l8hroreu0km8h0eifr1c/kumawolezorokosi.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/ritezejenunijaxalaben.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/bdd17ff8aa2e208516c1f9bd92cb8737/xurudositubomad.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-6-23/20210623023407875775.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a70c5716af---83208358632.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/3686776609.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/tazivenijepigexixi.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/2b50f4plojn0egp21hddp16jb5/30114022188.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/33728712381.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd968218c8---98554906217.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/22893926989.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=another+word+for+intelligentPDF 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_off0000b801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB801 14572 bytes
SHA-256: 9584a6d739e795d8d68db8bafd8246ac46e3129fa4786c97f9361afe34f69d6e
font_01_sfnt_off0000dc9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B6 10368 bytes
SHA-256: 63f9e13841a9d979f962a15e76972c272fd07834ca49f1d76f1d7eae37356a10

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