Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dcb516bc8aabe81…

MALICIOUS

PDF

94.6 KB Created: 2021-07-31 07:15:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7fb04f90f0b504f2276692d0c8621460 SHA-1: d42852700faa418d941ad4327f9f2f728b70d48f SHA-256: 0dcb516bc8aabe81770ef06599620c563bb3d600c6d523918284f427730cc220
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/9d67688757e2e96dde77956c793447b4/70487599332.pdf In PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/afcd5d3491843cfda14804650e349c06/74040229344.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/1897fbb6102d2a4f3a16465eece8c432/baxasedewidiluzatedakesor.pdfIn PDF document text
    • http://taitung-house.com/CKEdit/upload/files/bitubaxuferukagazek.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sofafan.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160fe80b5b698f---bibepiz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940fea072dc---tozixisegivixegor.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/4280886532.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16086e9752bc46---zodivonerelidafuxibisaf.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/cc73bf44fc9143883917c883b8a18aa9/mekogukomo.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-4-28/20210428210418363429.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f80daf25c2---60570515167.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/mujobatetalimaru.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160835f910e683---58845047393.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/8cc6efa658a45800ec559ff7127a5ac1/sopirupiguvozobosolel.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/72af6f757db68a638f543f2d8498cdeb/sunasugogexirigevowuk.pdfIn PDF document text
    • https://davaocarrental.com/images/file/fubipute.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/pk9dd8visk95joosoaofdlg676/22634534556.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078830191ef0---38308821945.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/16726345965.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a46dab95e41---wasaz.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/kofijiperaba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=research+methodology+of+inventory+management+projectPDF 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_off00010d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12535 11424 bytes
SHA-256: 53cd122d7a61604ddaef33f1caae2d6596a55c6578eaa78a41691280749433bb
font_02_sfnt_off00013fc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FC8 17204 bytes
SHA-256: 48b2eb54adbcd69df31b96747f23b82a4c9563ca9919df8e578c702443e67c20

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