Malicious PDF — malware analysis report

Static analysis result for SHA-256 8036d4727da6007c…

MALICIOUS

PDF

73.5 KB Created: 2021-09-02 21:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 95a3d07da98de5d6af842be3e3536bb9 SHA-1: ee0003ad01a0276c1d4d1b304685877398d854f6 SHA-256: 8036d4727da6007c8ff4c39310e17e5d0e2d8302ed80d5332b4b30bf071219b7
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised websites. These links are likely intended to lure users to phishing sites or download further malware, aligning with common malicious PDF tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://autotronics.vn/userfiles/file/jisetubanud.pdf In PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16074b197647b2---bonunarop.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/lesitizix.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/47715869297.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/wilutidaje.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a01cf09561a---35629061911.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16073584eda306---jasupulira.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/vejilabesojifazanuwajot.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202108291102158469.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/17497636164.pdfIn PDF document text
    • https://kultmotor.hu/images/files/5635064635.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/fanal.pdfIn PDF document text
    • http://superbarter.sk/media/file/52468551233.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160ee08d226f17---86026330145.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/e147ca5c5bb139d53f88adec2e7c2d95/fepexujapuwumidiboge.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/1244360289.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/dixajatukir.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/a9qjv4gu9s9cgt2atnhep24ee3/neduxamagolebadopiloredo.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/f6ee422d443649ced16714babef794e9/30150964598.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/zedikukimisewe.pdfIn PDF document text
    • http://polloricowings.com/uploads/files/vesokasaronum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=liftmaster+garage+door+opener+manual+1%2F3+hpPDF 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_off0000bb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB86 15888 bytes
SHA-256: 0ca42a80863b5186abca0be7a7ab287dd2bfd2ec958d8c676c72dbdf1b2d8f5c
font_01_sfnt_off0000e43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC51 11260 bytes
SHA-256: 421d2b9d6d34fed3c5e9bce18ee645a50083ec53d026bfddeaed99acbb0f2eae