Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7f2f502c26ec965…

MALICIOUS

PDF

81.8 KB Created: 2021-09-04 20:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e36b7ad8085f55c6c6324b62449e1957 SHA-1: eb8e1c2a7f1307491e8a9fa9b0ff78314b65a7cb SHA-256: c7f2f502c26ec9654b6a1fb073b77648a848c5302069d4349553dc9fc0f55012
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of a link farm on disposable hosting, with many URLs pointing to compromised CMS upload storage. While no scripts were explicitly extracted, the nature of the PDF and the embedded URLs suggest it is designed to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://feltshoe.com/userfiles/file/wuvoxopusasikibenofafafim.pdf In PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703c26b8568---dafobususixev.pdfIn PDF document text
    • http://momsystem.ru/public/file/497634247.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/73428863ed3975cad906612402538d44/suwimegebozujigenopaxiw.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1611ccbbadda21---6772208485.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20215132158284312.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/janasewiw.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac00aac3f5---rorufavagitizuti.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c296b9759b3---4324539390.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/lofijipikiruse.pdfIn PDF document text
    • https://magerp.org/upload/files/96006044051.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/79906659107.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/kimunetex.pdfIn PDF document text
    • https://samyenngochoang.com/wp-content/plugins/super-forms/uploads/php/files/i2adh462irpdplpiip2ao18c52/34468103340.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/riveva.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/72646357671.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/u7nid40t04tsr51issfk4o74lb/zegilisefemopapigasup.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/6e9a6a38b87331c4383c3bd6f7589d67/pizujaz.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/oe0mcllr7rraeq612ajgmaevu0/94955319142.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/jemexitevenekifadeke.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/jegalowabakaga.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/juresebeso.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/ad46d8dc6178d9749c500ae64dec9f92/33465944869.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=schluter+ditra+drain+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_off0000db21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB21 17924 bytes
SHA-256: 3cf88504ffce690c29678171230cd1dee88e920324773bbfcc86dc09586a3259
font_01_sfnt_off000109dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DD 10604 bytes
SHA-256: 9793c3dd41f394f73c73dc242a59617817df6ac5defc0296dcc9ff4019494940
font_02_sfnt_off00012203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12203 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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