Malicious PDF — malware analysis report

Static analysis result for SHA-256 f571df09f6d0a7ec…

MALICIOUS

PDF

73.1 KB Created: 2021-09-27 21:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 87e2a10efefeef96808437aebce07266 SHA-1: 56b6cb06fbd6c13f4da530066833709d3922c3a3 SHA-256: f571df09f6d0a7eca844e680504f4560e15378b822997fac9d8dc22debf47bd9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a ML classifier and ClamAV, indicating malicious content. It contains a link farm with numerous URLs pointing to various domains, suggesting an attempt to redirect users to malicious sites. The presence of compromised CMS upload links further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://pixomot.ru/uplcv?utm_term=nba+2k15+android+gameplay PDF link annotation
    • http://chukguwang.com/files/fckeditor/file/guduwejoso.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/77816554168.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c38baa626---87844822451.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16141ec554bf13---98317273175.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/lafowija.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/famevuputikok.pdfIn PDF document text
    • http://koala-al.com/d/files/49806959958.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/pajugor.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/12362120497.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/38723509874.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/60103505670.pdfIn PDF document text
    • https://ribaczpeter.hu/files/file/50002639199.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/76384237036.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/potudigenulimif.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/20954177752.pdfIn PDF document text
    • http://df-2.de/images/daten/file/fusaporefinaxabusozam.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210914082421.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/jabolezuwid.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/83950965966.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/veposugoxapog.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140931829e07---kigoxemavilitexebi.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614891cded683---24039749080.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/53150195584.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF53 2660 bytes
SHA-256: 0588d08630a051700f11095ee28527d2347c4ae8d87849bbc974fedd0bed88f4
font_01_sfnt_off0000ba56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA56 11100 bytes
SHA-256: e15662851c5ac67552427a2481ab58c5a934ed9a323c0807bbd2880d24dc1a46
font_02_sfnt_off0000d3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E4 16580 bytes
SHA-256: c0af5ca15ba49f58ab892ba8e19057f69b9b2320b8169d0f2215c8e77127f79d
font_03_sfnt_off0000fe76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1