Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6d7bd55f7ad99d2…

MALICIOUS

PDF

84.0 KB Created: 2021-09-01 15:36:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 96adb9778f90da9686a35132c7b159b2 SHA-1: 88e9425956353b39254638dde7b1e994ddb19f99 SHA-256: c6d7bd55f7ad99d2c9a0fd228a7c3450849c82b048e47f0bcd00bb021c22cd1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=how+to+measure+marginal+benefit PDF link annotation
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077898299552---rikeligafurome.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/31878301086.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/kk9um99c8uembael571egq8c7m/podififufapiwa.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/60236078025.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/08/10/58895929976.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5b21ce00f259719c661b550569360f6e/nebagiborijokujakepuna.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/jowopupiwaxefetibokomen.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf86d77524d---vepuzulasowupekili.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610e6e7a8fe55---92134490955.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/294ba4b57783cfa15e2f5b054d94718d/99182734369.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/fe4b4a6f7455109e83c5fb2bbcb6d7fe/didifujezonin.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/4t9icin7g8kgu093cd7s7s2ro4/jikuvukal.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/72556063172.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021051712003260.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611322d3b3e47---65586204045.pdfIn PDF document text
    • http://adbuffalony.com/uploads/files/55413153701.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/8117bcc75e41a2dfe925aa084c47fa38/9258154485.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/a702f25a849d5799543cbedaf46484d9/goduxazosagelurez.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/momepoborafa.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/25562264177.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/1676131096.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/93157164671.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/midit.pdfIn PDF document text
    • http://novichiha.ru/pic/file/75072129666.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c273429c5da---51822818273.pdfIn PDF document text
    • 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_off0000e02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF844 10876 bytes
SHA-256: e71b115c163d38bd54d027273024cdbe79f786631244c9b3f5f58da5a1bf4c7c
font_02_sfnt_off00011165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11165 18224 bytes
SHA-256: aa77e107224138f96293944f619d2644c4ba68233bec108b6ed0969ff4dfa09d

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