Malicious PDF — malware analysis report

Static analysis result for SHA-256 71d91defa77a64b8…

MALICIOUS

PDF

92.9 KB Created: 2021-08-13 21:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d36b2ef15c08abc5c622b5d8f5893952 SHA-1: 032ab5c04dc6d6368cd7eea1eee6b38294b02b76 SHA-256: 71d91defa77a64b85f8c148a0c25f067eec8cd81c6b86aed3fd956d3d1d51f39
156 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 of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to manipulate search engine rankings or direct users to malicious sites. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://alimentosldm.com/userfiles/file/13773415717.pdf In PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/10744699010.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/ac8da552a29146e2ddc66b6599eff34d/67510100546.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160703679ebef7---lerezu.pdfIn PDF document text
    • https://ayurmitra.com/files/file/josaki.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/lisikadavafubilotukekipax.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4979b6f8c7---9836216632.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/a70e0304d2bf61e06c31cbdc77cbb45d/6531396362.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ad7e93af1---99459863180.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/divuzegelubanimigodafejo.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/loperagugev.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/wisofofowurotumerokafikom.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/bed51ebf4ad24cfaf2e7dad08cd8dc44/3973323317.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/wolejapi.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160d8230bd27db---16215322482.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16280679226389.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160e88c605ff54---69745898038.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/gimodajepefa.pdfIn PDF document text
    • http://tayles.com/uploaded/pijowosif.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/93485262930.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb5e09d81b---59692009331.pdfIn PDF document text
    • http://autovoda.ru/upload/files/zipazijosiriwale.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+use+tascam+dp-008exPDF 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_off000100ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EE 18504 bytes
SHA-256: dc8c9f4d0f9825243b10fc213023f46fc0a1fdeb44c62568e232e373b3efd0be
font_01_sfnt_off0001326d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326D 10976 bytes
SHA-256: 2b87e514fd6c8dc82b5fb73e4c3ae2620afe8bfac559c81a094181409a9d266e
font_02_sfnt_off00014c11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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