Malicious PDF — malware analysis report

Static analysis result for SHA-256 14488758b8657494…

MALICIOUS

PDF

86.3 KB Created: 2021-09-15 23:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5b24975ed6849679f644afd60566f483 SHA-1: d940052d00b6d6c44e7c58528c6e2f65fcccd30e SHA-256: 14488758b865749423326641a64f8b8bf21e226fcde5334f81cfe68d1acbc233
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, directing users to compromised WordPress uploads and disposable hosting sites, likely to download further payloads. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic specifically points to the document instructing users to open a password-protected archive, a common technique to bypass security filters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://krisoc.ru/uplcv?utm_term=windows+loader+extreme PDF link annotation
    • https://sunnyrosesschool.com/userfiles/file/63200175161.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/fusitolozeduzeliro.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/22137320778.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613db4c9705d6---zodiridokasonulizukakadu.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/pupexago.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/50443004267.pdfIn PDF document text
    • https://irantruck.ir/data/file/xulemafefijuwadugimeru.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/64787057284.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/sizubufe.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/galixigawunesoxudap.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/komulodadidulowepovep.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/05/kixukenumad.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/52941548244.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/niraja.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/c0738e4d0dbad99f48a3efde11bcc977/wawavizet.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141162fb4219---83066618582.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/bakixiniletabotad.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/zukifu.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/48522686359.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/9fr3q22ldefaqm1no5fkk0lusq/31733872509.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210911_240DAEA2EF7F9D4E.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/8202cb6d9c62b9f04c63e2db4eb474b7/95750359493.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/fipesusafevu.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/belitedodip.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/pigeke.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_off0000e457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE457 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6E 10592 bytes
SHA-256: 6b7562f735c74dd86d785f4f14f24e2f844f421abf09e24c27d20e44d071ae3d
font_02_sfnt_off000114a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A3 21480 bytes
SHA-256: aa4ba9bfdb57c6299973057f025e1826a996e250b91a97f5bb38b150f5415d09

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