Malicious PDF — malware analysis report

Static analysis result for SHA-256 00bf06fb8177eb2d…

MALICIOUS

PDF

83.2 KB Created: 2021-09-12 13:28:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 05a24262f1f0cfafbea84da1ba7a0d13 SHA-1: 0f1ed9fc39642e7884a74eb95b53cc85209bfde0 SHA-256: 00bf06fb8177eb2dca8f704b69137ad83ca40fd13aa802c08d7431160f1d2042
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for delivering malicious content. The heuristics indicate the PDF acts as a link farm, pointing to multiple compromised websites and potentially disposable hosting, suggesting an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137b4610473c---denalekiwerotabawojegako.pdf In PDF document text
    • http://gr-chem.com/upload/files/wuwadaxovab.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/4d5d87c33efb8de2211a7b1005bd975b/69318476737.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/69416474520.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210906115151.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/pivovurojijebanosabirifox.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/donibifafesojozixid.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/79896466300.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/tegigijudikelajodobo.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/72798526649.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/1285591892.pdfIn PDF document text
    • http://daiichihousing.net/uploads/news_file/nuwogosobokefuxogonukix.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/jisodevugipasa.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613726e426836---45670555604.pdfIn PDF document text
    • https://suacuasathcm.com/uploads/files/jizewobokuwikexe.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/pakadilirebul.pdfIn PDF document text
    • http://strahyi.ru/images/file/lejebivomaxegixogufoxozex.pdfIn PDF document text
    • https://europartner2.pl/uploads/jowoxogagove.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/24173894323.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/lokigujojuwideguzof.pdfIn PDF document text
    • http://goldenmallbiotech.com/upload/files/pofikujipe.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/97173363112.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/63388125483.pdfIn PDF document text
    • https://verner.lt/images/files/wesuguraruxesezelofuzuw.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/11131882532.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/7437335205.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=visual+voicemail+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_off0000e10c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10C 10568 bytes
SHA-256: c3d1149de7a154e257288c473d2df839044931d1d3525986cfae5b38cb76a393
font_01_sfnt_off0000f91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11131 17956 bytes
SHA-256: 1d40031298232cc0332a62a3a41b13ff57b8deb7642e859ee0060181583bb884

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