Malicious PDF — malware analysis report

Static analysis result for SHA-256 41961d4f93f64722…

MALICIOUS

PDF

74.5 KB Created: 2021-09-04 01:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c032213c8df95b7776160acf53f3d3d1 SHA-1: 9623c88e212afeeabf21bb24e919c2d425fbbf14 SHA-256: 41961d4f93f6472229d845bfbf719f8e423cd092573c7390f449f92dc424f56e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lure users into clicking links that lead to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a5dc02fe1---tanonunebalar.pdf In PDF document text
    • http://saraiaser.nl/userfiles/file/vizurupidasogokove.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/25095580205.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/56189664983.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/53685279c72ae587a1399653bff5cb05/4570637081.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160abaf8b52902---poraloxufopeketuwuj.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/5d00a367c3cfb727da003febb1844a1d/kukajowapirojil.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/c3a6185cf2bd06e8f5322de66000f07e/27036212065.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/kofeludom.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/61218292323.pdfIn PDF document text
    • http://autovoda.ru/upload/files/tisivozisipaka.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/tujofepuvexuzalu.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/60144412138.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/5561151099.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/fotigovatetutolosur.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/9cc10c78000c5df8f01e7e36fe1122d3/93252493917.pdfIn PDF document text
    • https://losungversorger.com/product/file/lixetur.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/73843409900.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/3456017496.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/3pt722kds2bsm2teno4hj4c1u5/gokobawiputuzikesisem.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfe581e900---69309962970.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/gugozewarizot.pdfIn PDF document text
    • https://x-software.cz/data/file/36737147281.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/vinuposewuvigupod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=assessment+tools+for+learning+in+the+affective+domain+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_off0000c0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0CD 11116 bytes
SHA-256: eb9cd3ed824dc154083bfe231c4633761aa788614b8b90f3c924553a6cc13547
font_01_sfnt_off0000da59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA59 16764 bytes
SHA-256: 1e8ead49a8c89f6ac74d64a55618f32449ee8694657466a2e0701f6077546a41
font_02_sfnt_off000103ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1