Malicious PDF — malware analysis report

Static analysis result for SHA-256 99e1fc057c09db8e…

MALICIOUS

PDF

101.5 KB Created: 2021-07-03 07:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: f8b7febe80c2c5e65422f039f83a4a47 SHA-1: 8d2d972aeae5362fd9e9c4eeb03932c111e7b5d7 SHA-256: 99e1fc057c09db8e6faf66e6e99ff3a7301294e2c48c8fe617060b79c06fb318
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to other PDF files hosted on compromised CMS platforms, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload. No scripts were extracted, but the structure itself is indicative of a malicious distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9711

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://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d8d36902b---92977430235.pdf In PDF document text
    • https://defaico.com/d/files/gopaxizoxegagamunaja.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210622_DB4F2E44C50EEF2B.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/69156956309.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cabfb7f03f---78946249123.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/naxeg.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/e9b1aafab4c270e92b99f92710c98fe3/47985112271.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6893a2cb13---domopob.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/011533479353.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a037d8abbca---doxijaredozufikoseg.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7493cd9297---rujelivogefafuzupadeg.pdfIn PDF document text
    • https://designclarf.it/file/1212630998.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160caf193b7128---55901640055.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092705e48980---ferezumexolesudefij.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/404af630a38cdcd5f75ef2073e06f11e/vivufowuxilig.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160dcc8f56d99c---37843586048.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa9b3eb422---76813153995.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/76389417156.pdfIn PDF document text
    • https://4appsoftware.it/file/40305655731.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/xabupokovatifaw.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2388a2694---zowuzugeputa.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16072c67e56563---tupepeg.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/3916111252.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/jurajovapetizozobipen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=humour+tamil+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000153e1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x153E1 19904 bytes
SHA-256: 15b229294de937ca79f742409ebfdf6c201bf61f65fffbdf39af4fc68ace84cd
font_00_sfnt_off0000e717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE717 10376 bytes
SHA-256: 2409e6b1f1af8b023441856fa416133174f1fa9ce533a58b33dd62c5bff631a3
font_01_sfnt_off0000fe73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11685 25888 bytes
SHA-256: 45bf98b81da3a2d8acc19a6a7a3c82bc3bbe6521cac073e0507b63976d48ba81
font_04_sfnt_off000175ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175AD 4988 bytes
SHA-256: b1530910e02938d35537955e9e85a4f769ce6f6074bfd16bef32fe703b2393d6

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