Malicious PDF — malware analysis report

Static analysis result for SHA-256 f269007f544c0df9…

MALICIOUS

PDF

88.4 KB Created: 2021-08-12 05:22:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 05331412fbbec19a741f15700f005fd2 SHA-1: b6b23c1c5a2e00b88278d2f8010b662947890a99 SHA-256: f269007f544c0df9ee27a48b5473dfbfdbbcb77a7c55a2f94156561f1a1f4922
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the presence of a link farm pointing to compromised CMS uploads and disposable hosting, suggesting the document is designed to redirect users to potentially harmful websites. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://cityface.cz/res/file/xaxoma.pdf In PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160844f484a771---12695531345.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/43230887696.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/10348678558.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/bexir.pdfIn PDF document text
    • http://renovator.cz/files/file/lijetugenutet.pdfIn PDF document text
    • http://thegioioto.store/upload/files/jamuw.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/642c31620b186ce65a5698bc73ac9a4b/wefejasivepurodasis.pdfIn PDF document text
    • http://voijin.com/userfiles/files/manuwe.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/84755667145.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/1954748f98caf043c6e7a57290ff5f97/5411120600.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/kusigiwa.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/tm2h876ka85kfm6nrp6rspltcg/16500542334.pdfIn PDF document text
    • http://euro-ex.net/images/blog//file/lujupabewotulosuzu.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/waboli.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210720002628.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/gixeloteze.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/hvhd0be3uv4ck489uiltpq0sok/48303271520.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/16171456411.pdfIn PDF document text
    • http://venturahigh1967.com/clients/40640/File/68874264125.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/6707497467.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/78704739978.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/38502514744.pdfIn PDF document text
    • https://starbox.fr/img/files/tasumefivabumilapus.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///91185328422.pdfIn PDF document text
    • https://network-italia.it/file/piwozusijojakowijapunekag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+do+you+open+a+swingline+electric+staplerPDF 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_off0000ead3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD3 10980 bytes
SHA-256: 8be1aa0207c7fdfd2b3d3a19f951ea1020f09b42b27bb0c3c593447558b544c5
font_01_sfnt_off0001044b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044B 21392 bytes
SHA-256: 971a42435b6a98f313f95298cbca064ecc36a4960312b6a2afd4bbaa7344b35a
font_02_sfnt_off00013a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1