Malicious PDF — malware analysis report

Static analysis result for SHA-256 afa9abce65fb92b0…

MALICIOUS

PDF

76.9 KB Created: 2021-09-07 14:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d9c932610f19574db8fe249dfaf0c406 SHA-1: 712b20f39beb266579bd90e094a2f81d817a779a SHA-256: afa9abce65fb92b0d9b98a583c30eec51f2586120009d8ce5e73ed61db397c64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to lure users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=aluminium+windows+catalogue+south+africa+pdf PDF link annotation
    • http://nm-union.ru/ckfinder/userfiles/files/rotozamuliwuzifaxebejale.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/70725471556.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/tobomozasiwumulibemakaf.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f0e2e281d48---luxilekudureker.pdfIn PDF document text
    • http://nature-revive.org/files/file/43546494377.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096dd98e3d9b---lapizejilenapulufina.pdfIn PDF document text
    • https://jagamimpi.com/contents//files/65340671986.pdfIn PDF document text
    • https://stopserv.ru/files/file/14406249256.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cd32e3e00---zodixodeparudevikixu.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/80972402966.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/88846787719.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/89384726992.pdfIn PDF document text
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images//files/roxuba.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/toselorirarur.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/27568681417.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/55746ba47391ac5de6a42a50e77ebef8/wakozulefajowujoj.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819bd5a09cf---98567254247.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/e20ed53e992652cb24537709caa5f2b3/ritiwumakir.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/xurelodiroxadasisawigosan.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/c3gisdju21ovf7ah6pntpe81l8/riwetoweveluvipaxaf.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/linesajizanudasoranis.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ce11a558c---22682182907.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/gawapuxilaxexidupazob.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/sinolukixok.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/50258916456.pdfIn PDF document text
    • http://mdc.ir/ckfinder/userfiles/files/xozuzoseronuzoguwima.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_off0000c3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3BE 17780 bytes
SHA-256: d19118dbb066fbacee63321ad7d6e14f7e1be738210b011155dac4946cc66ab4
font_01_sfnt_off0000f1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CC 11232 bytes
SHA-256: f7dfa6cf4f622fa73e0983f23f6f228bf1458fc62155908646dc1da6107f45a2
font_02_sfnt_off00010bcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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