Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f0a500e1e51fba5…

MALICIOUS

PDF

81.1 KB Created: 2021-09-13 22:36:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: dbf1fb6ebed0c345b3ced0648de72901 SHA-1: 410e1d5acb90c7b73e305e78a1a6525ff6c3b03e SHA-256: 8f0a500e1e51fba557e13d529685abc06726953a244934855c8f23bf74d87c3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to multiple compromised WordPress upload directories and disposable hosting sites. These links likely serve as lures for phishing or to distribute further malware. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/322a4486780f476573bb20127d6317c8/72034230034.pdf In PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/26420cf01cc34c14c743ed5dac0efa83/74778476378.pdfIn PDF document text
    • http://gardatrans.com/content/Files/wodaw.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/48701014680.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/40497070622.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109041634146057.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210911_ED9AF61FAC1BD696.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/93264820275.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/bomunumituwakoxorupixi.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/fuwawitizomepipati.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/12386007283.pdfIn PDF document text
    • http://licausi.it/userfiles/files/zokakijijibijokira.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/n6he5e9h6to2cur4gidt263nq4/zikexik.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/pebaroxafaz.pdfIn PDF document text
    • https://dalyanestate.com/userfiles/file/rofugupokozokafusiz.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/futinawo.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/31620854913.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/tuzatojexemevekawovid.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/fukusipagaporaxumuse.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/83038719547.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d259ccfee---28406101434.pdfIn PDF document text
    • http://chinahongji.com/d/files/valesuneb.pdfIn PDF document text
    • http://adriennemason.com/assets/files/darexe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=3d+virtual+girlfriend+offlinePDF 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_off0000d89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89A 17764 bytes
SHA-256: 8860546bbf2eaab414f7d013e986dd98b088bcdde0c23183d446fc7cb3d902e2
font_01_sfnt_off000106d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEE 10604 bytes
SHA-256: 13c5ab2259e3716b321d6927f9bd5e14b1669becb364522cdb576549a140f9ac

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