Malicious PDF — malware analysis report

Static analysis result for SHA-256 bacc8db4d6b7b3ec…

MALICIOUS

PDF

89.9 KB Created: 2021-06-28 07:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 523235e1db0520f3d8f090fdf304fe60 SHA-1: 1b09be4c103b79b984b4a543bfa7c67c10220eb3 SHA-256: bacc8db4d6b7b3ec865399b68e4240ff604c7036b0635b603b48db54df9490ed
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://coretry.ru/uplcv?utm_term=photoshop+questions+and+answers+for+exam
    • http://rustproofingottawa.com/userfiles/file/71929954937.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a90943b604---87895793481.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/e1015c5cc80a06df19e323dd85c75b0f/bubozamosobuvofukusikaw.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/e96834eee4df7aeeba741db305192088/gejuredexupuvilex.pdf
    • http://cesurmakina.com/userfiles/file/48233327928.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16087ddd2adc96---wogebu.pdf
    • https://kurishupally.org/userfiles/file/pasasazogidu.pdf
    • http://jonkmp.nl/img/cms/file/15418363214.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb3b88a4f7---fabovubedefexu.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/fe52940ec3f1322d39a8627cf8ab9034/62906532797.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/2qt6dgv0c522viqeqlpppamt54/xijefo.pdf
    • http://auto-spec.ca/fck/file/22184725163.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b364cba49---71364435640.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160abceb96f040---povigoxadadim.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160952eeecfa01---sinevawaxanesukazo.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160955853580e9---9394322330.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e357d9f36f---kevasoxazabozalinuzadole.pdf
    • http://banhangcongnghe.com/upload/FCK/file/jezugokaxomikogomorip.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f4013a231---rawaloda.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6a172ac5d---kiwiriri.pdf
    • http://candemdientu.com/Images_upload/files/famorapoxasovek.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6324a1fc7---lidubalagopagiro.pdf
    • http://buyyoutubelikes.com/ci/userfiles/files/29502386513.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fadb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFADB 16792 bytes
font_01_sfnt_off000112ed.bin
7f4c9d682ac618e6694edba01f6559195fa8b4b602cc15d9c22e057dbb9dcd52
pdf-font-stream PDF embedded font (sfnt) at offset 0x112ED 17288 bytes
font_02_sfnt_off00014034.bin
bbea46cfc8552aede6185cf32a14cb0224891cf58daf37c9c0fd8e0f46eaa31a
pdf-font-stream PDF embedded font (sfnt) at offset 0x14034 11152 bytes