Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f12a8755ea9a672…

MALICIOUS

PDF

73.5 KB Created: 2021-09-20 19:36:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a83c324f3a170ef938e4f1b9f90268b5 SHA-1: 029ff198c81b5307cdde1695c167c9cc66f95242 SHA-256: 2f12a8755ea9a6727582babd346d5501dcf8dbf4b7082408a97708e56d565ffb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised websites or disposable hosting, forming a link farm. This suggests the PDF's primary purpose is to redirect users to malicious or phishing sites, likely as part of a broader phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=my+hero+academia+season+1+episode+13+english+dub PDF link annotation
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/bibilixakofusijovigujano.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/64225600136.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/rapulafemowomiz.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/zagalemoterapi.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/96649485236.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/54586829597.pdfIn PDF document text
    • http://tech-in.info/bramy/userfiles/file/wakubu.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16133eb0f68aa3---16143497864.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/86620492746.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/42221437903.pdfIn PDF document text
    • http://paradoxine.com/upload/files/matawagematatosut.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/wasotiruzuwewusigokomu.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/de1ec52565ba8c89d5656028be92c92c/xuzulatozutedegegugo.pdfIn PDF document text
    • https://bientannamhuy.com/wp-content/uploads/files/wijap.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/56236561967.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0b60d4d65---xapotiropu.pdfIn PDF document text
    • http://nemochem.cn/upload/files/tedifamizosetefa.pdfIn PDF document text
    • http://europavloeren.nl/siteimages/file/pumomaduvagaj.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/54173570348.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/4676529425.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/63540510332.pdfIn PDF document text
    • http://czechnews.cz/userfiles/files/62831766323.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/30632706468.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/firugafalupedum.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/1118607510.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/25755871982.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_off0000b7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A4 11436 bytes
SHA-256: 7e44522f4c9a03f63e37da8da320d69d9627dff08bd546c216278eaaed9d070e
font_01_sfnt_off0000d211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD211 17768 bytes
SHA-256: fdbe59abae0eb84d3079a4de91f4929c8cfb3c007a01be8239bec1fe472d2b1d
font_02_sfnt_off00010029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10029 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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