Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f4b7e326532bf65…

MALICIOUS

PDF

84.2 KB Created: 2021-08-27 17:28:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7381db22e77d306fdbc9320d475fa5d3 SHA-1: 079bb01c0ce7a3d7a964824e39b5c0c503f7b4ce SHA-256: 7f4b7e326532bf653973e5041e24c8823dee664e62474bb6d1157e844a7e1723
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites or disposable hosting. These elements suggest the PDF is designed to lure users to malicious sites, likely for phishing or to download further malware. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://krisoc.ru/uplcv?utm_term=i+saw+you+last+night+and+got+that+old+feeling PDF link annotation
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607fee4fe07a0---35317985973.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/83073733563.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160844ec1656af---saluvu.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/xejovidorabivumawipariv.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/13775444515.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/qatgk98a1chclvm6pq5mdn2an8/domusitunubudoxerufosakew.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/winomuwut.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/sekalira.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/28082611133.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b461b9172---76210889847.pdfIn PDF document text
    • https://tungqibiotech.com/upfiles/editor/files/tegapaxivigef.pdfIn PDF document text
    • http://vincentianssjp.com/userfiles/file/71623613795.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7a347e691---pixosofora.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfcc1ea079---selebab.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc3eb026f0---56848160194.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210713183323428.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/26808654716.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/e21911068b5bf2aa4b38ae2dd324a861/75473738631.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/guzakogoga.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/77690949236.pdfIn PDF document text
    • http://belean.pl/userfiles/file/kamuxuwewuxababubeni.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/ta3c5o6n41c5dobll1e0223hf3/xejuri.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/93812325518.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/rugep.pdfIn PDF document text
    • 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_off0000e2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD8 18292 bytes
SHA-256: 8bf327c56efe21c6879fd442ddbb3b8aa711544aaf9bcd9a5ffa2880815ccb41
font_02_sfnt_off000129d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D5 10784 bytes
SHA-256: 02256c8f9070b80ee81241b8f1eb3a299712c543ad95a0df18a56b5f6045e1ae

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