Malicious PDF — malware analysis report

Static analysis result for SHA-256 a73b7897e3062c9d…

MALICIOUS

PDF

99.3 KB Created: 2021-09-05 16:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8946a3707edf1b2af45bc2e9b27e23b0 SHA-1: 4a48c77ab69bdc5a4a116314bfe885887047e56e SHA-256: a73b7897e3062c9d92e09e74beadff20e07230d6df757670a967505196870c02
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' reinforces this, indicating the PDF's primary function is to host and distribute links to malicious content. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/uplcv?utm_term=yenne+lee+autumn+leaves+pdf PDF link annotation
    • https://extremedriveline.com/ckfinder/userfiles/files/95014269680.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/fj43br6sf0156n8rn2ee1fnn36/1365241175.pdfIn PDF document text
    • http://cecev.com/stockages/files/muwirifigoloro.pdfIn PDF document text
    • https://roomart.uz/ckfinder/userfiles/files/vadotumediruxunipowem.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/dunizisix.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdd91abe81a---51329550689.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ded3cb94eb0---43179952554.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/55538363983.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/302fa7e1bb6d74a6e3f1a9d2d8ace04b/78140311584.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d48ea808cfa---wanavokawonidutovedit.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/73957358717.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/povutezavapol.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/2667f002ee4487b487446a8986b49302/8574320136.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e27eb52ca81---jefezijetir.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca78405a6a---bupovopusegudini.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/96832717266.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/riwite.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/3b7be0343935a92a5cfa4f4dfe63d3e9/puzezopajawikaxofev.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/glu28eptk3m18j68p2ffkegu59/xezexokimotinunedufok.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/0e17dhjvsoe9q76iau88joktt6/95600746147.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/52024665966.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/noganegoripusinaf.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/dopejegaganusokifufoj.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb720e0f707---27541542395.pdfIn PDF document text
    • 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_off00011ac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000132da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132DA 10496 bytes
SHA-256: d1fc8c449ce3e187771ed907bd680a2b471e7c4e4baff32cd21824fb398be77c
font_02_sfnt_off00014ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AB5 19912 bytes
SHA-256: 5e849d113d2fada7b1d312c6cb105043c1d1a78b30f34739954eaefb90ad097a

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