Malicious PDF — malware analysis report

Static analysis result for SHA-256 14beaa731ef06222…

MALICIOUS

PDF

84.6 KB Created: 2021-09-08 06:42:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f79e1e19989e5360a12f7f3542b0c531 SHA-1: fd850d9c78cc66fbd5c9b7be4fd2f2e503520f75 SHA-256: 14beaa731ef06222f73e0c8c672b4fcd5d45806f6dd61a1505ac59af37fbb0ff
156 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 reveal it functions as a link farm, directing users to multiple compromised or disposable hosting domains, likely for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the link farm and the PDF format suggest potential for embedded JavaScript to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://thamdinhgiadaiquang.com/img/files/53429184488.pdf In PDF document text
    • http://alexlunacoach.com/img/editor/file/22283512132.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/45940540588.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4c9c415026---30712610585.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/wekesizuvurirapole.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/nidatupepamusevibod.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/73108457821.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/lumapelakejoboluda.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/568d174d5eb5251ed23f9a72e4cb39db/jetikojagex.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b4511f2d2f8---kevasodevokegoledovopiji.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779d33c683a---38807674956.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/7f9f65d22c5f65d726e97e200dbb34d9/wunoxejoketuzid.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/kuxejovebewunasoz.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f9c401e3c---wenoruzu.pdfIn PDF document text
    • http://birdwatching.sk/media/file/wezimanigumim.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/7b41c58c699caf13615b919aa5cae579/situkefijalo.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/mevolavizipufuxamalajala.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/tazaruzuwolapuluwijaxim.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/23e4e73668648a23312f61acb871a3eb/65983677784.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06f6022893---96350234057.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/c3cc7c5b2f297b6e400f1ed33f4a80bd/42907738479.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/6af85e03777834d81ea6b94d7e96fd88/59773858675.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/vawobekidilivifokiletunas.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/72894e3892e52aacb026501d7e26428b/21604467806.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/161176dd9bf6cb---13192833140.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=anticoagulantes+pdf+2018PDF 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_off0000e0a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A7 11276 bytes
SHA-256: e6931e13d09ff5ada1f157532e4aab12449454842e7ca7e2be713e9e33dadc61
font_01_sfnt_off0000fb32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB32 19256 bytes
SHA-256: ef367fb3676d35e3472e84ddad7c4c8f970472921cdbc1651677767a5efddc2a
font_02_sfnt_off00012d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1