Malicious PDF — malware analysis report

Static analysis result for SHA-256 f01aaff9b2bbf318…

MALICIOUS

PDF

88.6 KB Created: 2021-09-06 22:30:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b53d824f5c5821dcd44c6f8ca2dee932 SHA-1: d9d5c2dbd710182d6c83aae92d48c17bda49e168 SHA-256: f01aaff9b2bbf318694a018cc2caca322b34a457f8f8828ac53ee12ec0f3660b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://tl-systems.hu/files/files/vedur.pdf In PDF document text
    • http://kamnitikamini.si/upload/files/55426545915.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ef060fa0e---45913629761.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/2c079266e8346969d61f6abbe0136399/vopixagenaba.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/45339822357.pdfIn PDF document text
    • http://bean2beenefamilytree.com/clients/60578/File/71506536510.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/kejigixorunilebinebo.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/fonivemitubonojapale.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/zeparuletarobul.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/8c10ec28e19185692430979056326f92/xapobimikonediwopafaridi.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/73804998341.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/2700857136.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ee8d9f1730f---nabenuduxujumibububugul.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/b07fa4c5659f796dd7f0fc131eb94394/vakosam.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/15354293858.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/81364687424.pdfIn PDF document text
    • https://lecachet.fr/docs/files/dodejigiwufuvafaketir.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/udhrdfvjb4bn3grmvdcj37malt/61614699826.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716a093c7ff---46143736881.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/2981554561.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/xejap.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/zidofilatajagosatetupa.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608f49cfd7c77---65235823231.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=ashampoo+pdf+free+lizenzschl%C3%BCsselPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/zifizepelofojofixo.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_off0000f2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B03 17728 bytes
SHA-256: 2a27fd13a4897d74f99f11f2488fc8fccca688e2eeaa56f322a9c661a20840a2
font_02_sfnt_off00013976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13976 11020 bytes
SHA-256: de80aa07b7ea3871af8bb7c06c260fc7b3a505ca2c5898042877e61c928b4f49