Malicious PDF — malware analysis report

Static analysis result for SHA-256 c388389cadd91a08…

MALICIOUS

PDF

82.1 KB Created: 2021-09-04 07:32:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5c3792e7c7a37ac208796daaaedf2ffb SHA-1: 22555a5765a138980038bb04bde005d1a356e4fe SHA-256: c388389cadd91a0883588967a051e50b0753bda0d85f83c67a60a779b4e9cd1f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body was unreadable, but the heuristics indicate a lure mechanism is present.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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.
  • 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://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160e6cce95ebf4---2267212024.pdf In PDF document text
    • http://sanruou.com/app/webroot/uploads/files/98631151029.pdfIn PDF document text
    • http://iwishop.hu/file/woziremolafofudagabazoko.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e42dd0033d3---69432242880.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/folufadurodo.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/7922613881.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/50456705042.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099cdd7aa2e4---budebewegodogegugivovo.pdfIn PDF document text
    • http://vkts.se/userfiles/file/vefebabidonatovutelok.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84b19df069---gunugowanorawozumoguxalul.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/nejizanupigiwirid.pdfIn PDF document text
    • http://campcolefamilyreunion.com/clients/82065/File/29658462734.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/b9744f4883f766e9cd71b1736c98df41/zidodilelojobo.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/50574601785.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/gubowa.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/45242573265.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/50779613379.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/12430910157.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/ladakorix.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/17096788072.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/7413ee5bf511fb37ac09068310c40a94/zudibupixukufew.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bab8ac730a7---solasaxofigusubazigabejiv.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/27186605004.pdfIn PDF document text
    • http://gujaratbusinesspages.com/userfiles/file/97749761087.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/janilafikusuk.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160703337d3a1a---vubafubigilolujezivege.pdfIn PDF document text
    • https://path.mn/userfiles/files/venibavarapepa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=managerial+statistics+questions+and+answers+pdfPDF 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_off0000daee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF300 17788 bytes
SHA-256: 97dff3346b4aa6c0dc150f68e5716da4450c320e3a7a113ac87c26ce166923cb
font_02_sfnt_off0001209e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209E 11120 bytes
SHA-256: bd4ef81b9394eaf39ea1651c83f33702be40084a6576f7a6c533c9dd158bd541