Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba310ae8583b18d1…

MALICIOUS

PDF

90.3 KB Created: 2021-08-08 09:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 12aa7c65499417e74f3b4d514eb76862 SHA-1: 809dae88654d8eae1db59f04b6f695a8b187b585 SHA-256: ba310ae8583b18d121ab809e227233ff06a57ae724c118491daeea6710bdddc5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://travelinnsuites.com/nbloom/fckuploads/file/rinanekabipon.pdf In PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d4da7d72486fa7a7fb6b1c9df7e9d743/polijanililigufibaxap.pdfIn PDF document text
    • http://asid.rw/userfiles/file/93210462930.pdfIn PDF document text
    • http://rajeshjshahani.com/clients/d/de/defaee86e9f1fedea086b53a5072ac2c/File/majep.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/3n70eqo0qk1ji42aa33oc0dt9f/83443966067.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079089cb3487---11033794323.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/zivakabadis.pdfIn PDF document text
    • http://crackershrimp.com/file_media/file_image/file/2158117845.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/bajovibujuju.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1055da6e7---putem.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/16sm7jkf8ip45trvoqnq6lose1/vorib.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/44b603895d04ecf4804ee7a355c85083/sedepusosebovepugu.pdfIn PDF document text
    • http://dade666.com/userfiles/202106file/2021062711283670554.pdfIn PDF document text
    • http://chinazzjx.com/d/files/93949481671.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/patesufanigotizizediminuz.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d87cb1c41---dosinujemejegadile.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/fa3cfd91f25c39b7311d1119e99ab940/ponagipegapanen.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/79r8eniab9t6strq6hpfb372v6/56759717689.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6220e0aaf---wivelinedaduvevo.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/vivalipatimipumil.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9ba0cb0ce---wojabekorajazuzi.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/5cdd114e2dd6189ffce2fefceef38f3e/xogavipitax.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/25993989947.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021072712545431.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dce3f06f766---vasuwaroxonuguxugufegaj.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/e967321eb5b87206554de564516f561a/35401625564.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+begin+keto+freePDF 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_off0000fd37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD37 17336 bytes
SHA-256: 86a4181e1c8aa7ad7d038171e64ba3c690d47f1895cb76e3407d98b4f1df4a37
font_01_sfnt_off00012a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14280 10324 bytes
SHA-256: 1209a54b0c3eb8c02fc036014d69baacc0ed593fd110aa002a03df839949ed7b