Malicious PDF — malware analysis report

Static analysis result for SHA-256 71b9cdcb26d8554c…

MALICIOUS

PDF

135.1 KB Created: 2021-07-19 15:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 357580cae6a0e9bb53d06e00f134d594 SHA-1: 37280d9091bb4efd731d2c3ec317b8fca6c5fc73 SHA-256: 71b9cdcb26d8554cdbcc9505a9bd8518d787d7532a3276f7063a3f6a2d646a90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute traffic or potentially host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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 https://cleaner.pl/userfiles/file/44287114997.pdf In PDF document text
    • https://mariellatriolo.it/public/file/jevipobipavutof.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/6f76a150a11d02a80ad2d4ee853a41a0/7987901361.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2711bd96eb---luvanepare.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e419bd2273---govexirodesozaxa.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/011415433441.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/c96fd1ff35b2ce28753faf5caf0883f6/12454018202.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/reviregilajezab.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///85213761589.pdfIn PDF document text
    • http://xn--szabowski-tub.pl/userfiles/file/3984278335.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16805530dd---131322598.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/fanatinomixisegaged.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607430cfc73a6---zerumubonasilutebesax.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f6e4a2510---9741365901.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/836ba01a98094dd0df429a53eba5ac81/42745271160.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/zugijanimot.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/tutonulufolin.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcd35b7d88---99662957409.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4983246aa---ditakinurogiz.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1608466b8c2e4f---vizesobo.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/b3d2be0cff7127a765608c3e3fa8c3f0/jomitenululevida.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/sefiganinusubenemijupi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=service+disruption+meaningPDF 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_off0001ac1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC1E 19144 bytes
SHA-256: 7b088d21179a5524cd76c9509b48ac1d670751b5fa060c557792e5b2aa2a3467
font_01_sfnt_off0001dd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DD82 11052 bytes
SHA-256: eee8f65d28d1c2e2f081158821347c50aed3dfd0bdcdd0f8af59de7ffa979fe2
font_02_sfnt_off0001f708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F708 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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