Malicious PDF — malware analysis report

Static analysis result for SHA-256 6939d020d8dd3f3f…

MALICIOUS

PDF

84.2 KB Created: 2021-09-07 21:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d62c16dc024b9e966c27bb3028c962e6 SHA-1: e29bd03161afc8b619a8936226dbb9e4106733c2 SHA-256: 6939d020d8dd3f3f2022fd3c0169b0adc327e94b88bb3d9c9604ace35fc8faeb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malicious link farm. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a phishing or malware distribution vector, likely delivered via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9686

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://branonperformance.com/ckfinder/userfiles/files/katezazosesepizipurotoner.pdf In PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/kmoer1u3miepkpnrq5q9dko4li/77752246754.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/54458401529.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/tepuzere.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f50a2aa92e---31924037923.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/87339516540.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/meduziroximudoti.pdfIn PDF document text
    • http://alptw.com/images/files/9104556715.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45693667480.pdfIn PDF document text
    • http://master-br.ru/img/file/96389956894.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/jugowuv.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/efa7ccd092855263f879a094afa80735/valemobakimo.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160751091ada27---maxudutulitamifula.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/27863840921.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607359505b661---dedibi.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/kimibopavosejijila.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c68774ed015---bipogeruzifugavewag.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/b58af0bafc896ecec9ab4d9adb3ce92b/8602005156.pdfIn PDF document text
    • http://rafaelokazakov.com/file/92288434602.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/wudavisebijuduvosori.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/vetafidonibusuxulegake.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/sijupuvanag.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/328b2215b3259c846c8992ae7a982f5c/jimesuxovinutigo.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/bukaxikovulupazosojazo.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/2e9d38561e2a9b8e8693d901e2209e38/zitidoxarat.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a61756d3eb9---nobekomivaxurumuweligeze.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/sininarokapo.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f356fb28c6---40618855831.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=trigonometry+formulas+pdf+for+class+11+and+12PDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE03 11312 bytes
SHA-256: 9b94869fd5dac79b1c40c7f6eb5314df25313ca48dc87924b9c3b4388c336a60
font_01_sfnt_off0000d87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87D 20224 bytes
SHA-256: 429605b039698ba7fbf18325bf5be20b2512b0a3481f926bca93f4ed90f46da5
font_02_sfnt_off00010bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000123bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BF 16192 bytes
SHA-256: 126aabc53b187bc4421529373f04e2f66a11804dfeaeb35cb650b132d56c1dbd
font_04_sfnt_off00013960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13960 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc

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