Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aae27a019795f0c…

MALICIOUS

PDF

77.8 KB Created: 2021-09-07 03:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3f5b35f58f381a96dd8dddec219ccb73 SHA-1: 764cb339c5f7d15b5731000335c814f81da5d19d SHA-256: 4aae27a019795f0c671b1bbac65e37538fe2af69b7c4b3cd771d6ee18b3d4467
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting sites. The PDF contains embedded links that likely lead to malicious content or phishing pages, suggesting an attempt to lure users to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://archism.ru/uplcv?utm_term=mixed+conditionals+test+pdf PDF link annotation
    • http://adice-area.com/pictures/files/87555483719.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608666c2bf95a---96561412237.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/mesinipoketosikazosaze.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/raboto9famf2fgvn5g9dmsqjha/garow.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/81084131413.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/japinitanipiruputawajat.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/0d15054456467665ce6e03d71637807c/fadinixixi.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd2946d214---juwovewawosujofu.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/44246440534.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/2e096c9c15115944895c1daafdcef12c/xetukidule.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2b3f5602c---wakufiwojuxajudoromufe.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16075de2675fb8---59786864466.pdfIn PDF document text
    • http://zae.me/datafiles/file/nubosenaf.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/86139919699.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210806105847.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/e10e0b7c983276af2f7465c18ef2509d/24644575877.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/43807467319.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/24085841946.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210731020341.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160954d2d19373---vaxabos.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/29965379596.pdfIn PDF document text
    • https://prosperitas.be/data/assets/file/28058047067.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/kolikupipiled.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_off0000cb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB64 17464 bytes
SHA-256: 90d66936034ca9b0b1f5fb598cd43021cbe9fc6ab172048a15e4621190c7b034
font_01_sfnt_off0000f901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF901 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11118 10608 bytes
SHA-256: f043eb0a7c39b7a0fd1dbfe341dadf921b89acab030a121e58bf1b364fdbe7c5

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