Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfce40b016a6de47…

MALICIOUS

PDF

88.4 KB Created: 2021-09-19 01:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 4488f11a043bdd011ea29837e4cc5c4a SHA-1: c69e723f51052056ba98ee8da76a5ed6021d1346 SHA-256: dfce40b016a6de47c1bc45b3ca6a290988ae60ddb01c9d9820dee3fb53313558
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on various domains. Several heuristics indicate this is a link farm, with some URLs hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware, hence the classification as Spearphishing Attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://salon-urody-bellis.pl/images/file/xaxodolosabavevowu.pdf In PDF document text
    • http://gaineyranchaz.com/userimages/92176686143.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/larikaxa.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/64033150121.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141626db2a2e---fidofewenozafominipetezaf.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/bepamifaji.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/nolabusikejiti.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210910202142.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613796e5cccf2---vigujepoxebi.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/2273fbecca372c32ed1872e034f73068/21408066233.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/gapamek.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///88490297900.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a89c06992c---rakanadivefusavajeb.pdfIn PDF document text
    • http://entrackintl.com/uploads/fofesuzok.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/degewakafusoxivolesufe.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/6ae4161278f238c930d728fed234f414/5629098424.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/xalubipajenipuxelovilov.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mutegukakilovefolokegi.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/karezat.pdfIn PDF document text
    • http://thermocomfort.ca/userfiles/file/fofobivij.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210901_592BCF7BEE804923.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/bojonudonowuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=next+walking+dead+seriesPDF 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_off0000f548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF548 17940 bytes
SHA-256: e7cceea6066fccfbea0a9b8dddc6aa953f526b0ff6486602338d035907dba8df
font_01_sfnt_off000123b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B6 10560 bytes
SHA-256: ff5cece47450caf09966286eedd8d2f66ff20bf6a41993a65f071b41195c492b
font_02_sfnt_off00013bc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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