Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c14bea8203a8800…

MALICIOUS

PDF

82.3 KB Created: 2021-09-18 14:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8685f0599cbdcea8fb5a5a746c6fa396 SHA-1: ffcd24a3dfef1a540421f7713228f9d8fb232809 SHA-256: 0c14bea8203a8800946e8e00c84c673dbff44d312a03812913121d3c439d49ce
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of a 'Password-protected archive handoff' heuristic suggests the document is designed to trick users into downloading an encrypted payload, likely to evade security scans. While no scripts were directly extracted, the document's structure and heuristics point towards a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://dorp.pl/userfiles/files/viruvox.pdf In PDF document text
    • http://kino-cosmik.ru/sadm_files/jemanujovowa.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/83341240784.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/2617901152.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/vovevawepog.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/96733697708.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/43a842b5569c4a78459b071c5a6f8207/bulesilolokebamux.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613942e8c4648---wevav.pdfIn PDF document text
    • http://petswithlove.com/cvsprojects/SSK/Source/2.0.0/images/files/87797320332.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kataxebupevi.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/65970653594.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/3e8ef373505be298a8088e0befabf4f9/64431435820.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/80915502292.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16134e97c48314---doxose.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/65218085507.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/nodixafikuxemodajizin.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/383012201.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/55190130597.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/59136714648.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109100349083884.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/bexawofafozoxanobalo.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/jesamejotifozedawikek.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/kovelowiratirafomup.pdfIn PDF document text
    • https://panoramabyty.cz/content/tekomimu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=naruto+ninja+storm+4+for+androidPDF 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_off0000db3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3B 10624 bytes
SHA-256: a83ea5edfba8ad0a7680a5bd5bc2d337813eba6f5366a0678e041d4d82affaae
font_01_sfnt_off0000f37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37D 18560 bytes
SHA-256: 087f020a9b4455e2eeb349681c7ddb9c7da4b828d408ffb66945339996de1ff2
font_02_sfnt_off000123b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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