Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f6d9597852fbd5c…

MALICIOUS

PDF

94.8 KB Created: 2021-10-13 09:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9b88511329f5100efa0d03078b1e33ee SHA-1: d4fe0decf07a1c5b4dd09b98b67faf8a3b599601 SHA-256: 7f6d9597852fbd5cebd211a2a718af60576d7e916f2c36bd4aa44d4a4185404d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically classifying it as a phishing trojan. While no scripts were explicitly extracted, the nature of the link farm and the detection suggest it's designed to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2e637a329---15791173260.pdf In PDF document text
    • http://parkingparts.com/Upfiles/file/37305963468.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/61523730745.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/25895538526.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/jugenaj.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/50981321899.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/8972796946.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/gesurowen.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/51146271872.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20211011211055.pdfIn PDF document text
    • http://hasyo.net/files/file/wanibuketusoti.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/xupugosewasowuj.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/tigatujutagidoxodeta.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/i1r0kf1gns93247k2bbtlap851/38516488278.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/ccd6f229820fbaa4d35d5d911b979fb8/vugudivewonuvoruwut.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/35794339577.pdfIn PDF document text
    • https://topupdana.com/contents/files/binibebapurufaxixe.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/99887640144.pdfIn PDF document text
    • http://skinct.com/upload_file/file/Fl202109280824136275.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b902562e65---20184717253.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/60020648039.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/6Zflnl449io/uplcv?utm_term=guillain+barre+syndrome+natural+treatmentPDF 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_off000106e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF9 20520 bytes
SHA-256: deb2cf3be9952489a0f044ce348fbf75a191f2472edcb25dbba785dcd05df651
font_02_sfnt_off000154a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154A1 10800 bytes
SHA-256: 23699982fdcc6736bad80ef1de798a15c0f755c870ae8c1e8262877ce51d1b9a

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