Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe88230ae8755a5b…

MALICIOUS

PDF

80.9 KB Created: 2021-09-06 20:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f7dcf3194d0253f95df875ec3f5b109f SHA-1: 1bfeb23c948b536ad103c227d6e07e8b51f39481 SHA-256: fe88230ae8755a5bdd6d34ae371958c30bccbc497fe2c0a672a7250b2c09609c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content. ClamAV and ML heuristics confirm the malicious nature of the PDF, likely serving as a lure for phishing or malware delivery. The presence of external URI heuristics and link farm indicators strongly suggests a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://akkoryazilim.com/userfiles/file/27514527113.pdf In PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/68937650055.pdfIn PDF document text
    • http://bienbao.org/uploads/files/30649751171.pdfIn PDF document text
    • http://imaginove.eu/data/Files/44848111428.pdfIn PDF document text
    • http://minhnguyenvn.com/uploads/userfiles/file/zobogazovi.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/zirisewiv.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5a80c3c3b---fisovonemotuguzo.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/305217a565c532d531dda5f2d244ad80/xuwefuturenelekume.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b567cbea2dd---81482768708.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/65081331842.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/gufisufofijarumez.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/pisofamupowuseneviminu.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3653dbfab---rijivotewexanitoguwewi.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/xozixibojunusuzesejokefet.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f14964e2d1---15553067480.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089cd3b2af68---wubobinekalulagilovopoxi.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/joxujelul.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/93058652538.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/470dd66be50ecf5eb77c26f7aa3a856d/23098675885.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/45183994495.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/48577060887.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/gilurisibudupemilunefu.pdfIn PDF document text
    • http://sakra.sk/storage/file/46794524542.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=learn+support+and+resistance+pdfPDF 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_off0000d9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BC 10624 bytes
SHA-256: 64ed7d410457b3d81d70c82bd37b33970f6fddfa3a6e6f8094d2837f053f199d
font_02_sfnt_off00010a1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1C 17124 bytes
SHA-256: 21f5134a35e91fc660ceb13136a3f05a09e8271c7efa8719d20b80f7be9c9ed2

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