Malicious PDF — malware analysis report

Static analysis result for SHA-256 43d28e5f9f607f96…

MALICIOUS

PDF

82.3 KB Created: 2021-09-19 13:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 69b97975df71bf86b46ca5a860b1851a SHA-1: dcb2cff2a6dfa5904898c776235b3d15515c0648 SHA-256: 43d28e5f9f607f962bc0c6b274c519f1bcb3a9ca073efbe745ab0cde74352b76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is part of a link farm designed to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd95db089d---zasiz.pdf In PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/42547977742.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/68827781389.pdfIn PDF document text
    • https://avenue102.com/uploads/file/gogadojagunivojore.pdfIn PDF document text
    • https://unaizahic.com/Files/files/83692907655.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/webejavuwolez.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614161ded1092---xawizebisuxurus.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/lujelel.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/26308403925.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/defezufejujewisexomifafu.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/62684350468.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161302c79ee6c6---214451203.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/vbh0i356tuo97mg1bbhv5r8d24/4923124062.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/mavuxiwutakari.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/dukedawixajamazolelonexag.pdfIn PDF document text
    • http://telecycling.org/files/file/fusegede.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/6602723629.pdfIn PDF document text
    • http://crediramasrl.it/public/file/14435437295.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/lurim.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/xelufosesadelewaxa.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/89365723172.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/5ddcb9da972014af49f04f4952cdd36e/25018171640.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/63761731545.pdfIn PDF document text
    • https://kaparatt.com/images/File/daxozonefop.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/b5583829d1ecdd43ba73396220d05e43/kufabivitarodupusido.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/tuvopedijupukarefufepol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=remove+pdf+security+restrictionsPDF 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_off0000d5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D2 10900 bytes
SHA-256: c7bfc6457d9928733670641d3125f316c32d963362bc8f1694decee34647926e
font_01_sfnt_off0000ef1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001072e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072E 20088 bytes
SHA-256: 437cb0c5808957b762977eb49d8d72894f5c4cf2c4436e3370f3863ff0b1c241

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