Malicious PDF — malware analysis report

Static analysis result for SHA-256 2770aca6d5ac25b7…

MALICIOUS

PDF

88.9 KB Created: 2021-08-29 20:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 30e1ee15cb4e085c6524c761914dfba5 SHA-1: f25711e92186a650153615f2c79896b1b363a7ae SHA-256: 2770aca6d5ac25b79c45363763911eb5e22be2b79699f662d9cc92c4b073e4d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://longchimvac.net/app/webroot/uploads/files/53546535437.pdf In PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210816_BCF27C78E59EC6C5.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/pulepunefiguginetuzi.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/caf523861296d0ebdffdeea9ccc6c6b1/bomafitajij.pdfIn PDF document text
    • http://mysistermyfriendministries.org/clients/85776/File/vovatodovusufapowowoliz.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160df6d7f5445d---jojinugokixuvudawifivaje.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/pikeviwegovesepanegepi.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/poribenaruxetamu.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1611cde45d51c1---43022177017.pdfIn PDF document text
    • http://chineseclothingonline.net/File/berosivelinumojeba.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/nipisolojepetezapovor.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607193801db04---nasedo.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/17ec50b17f2a35af348775c3df004bcd/nudalalavajizub.pdfIn PDF document text
    • https://suksesunited.com/contents//files/5372116287.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/97626634409.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be55e8153e9---13604194651.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/1f34e5d80d6d9d600a9d7fb5090a86bc/92123096273.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/xojugowuvetamu.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/24126347599.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/66899915168.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/2bn1ieokjn87r5uj5ueca3kf5e/ludozas.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/gifukavegiraragubitagevo.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0f441446c---66242751637.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/52560028601.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=dodge+sprinter+owners+manualPDF 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_off0000f3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC1 18284 bytes
SHA-256: 959a77fc8ff60662e5122e9cd21f7c187b99869bee6c1f8add70353adb303421
font_02_sfnt_off00013bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF8 10924 bytes
SHA-256: e600695636900bfdfeaef2eb18c72c82e6b0109f8585e160048f8599bb2749eb