Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6911efc6d6df022…

MALICIOUS

PDF

97.8 KB Created: 2021-07-06 05:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2c191adb66d7ec25bd6fe120ebc52d31 SHA-1: 18248c11b0ea42e814021337c56edf06d9a729bd SHA-256: a6911efc6d6df022e7b5ae79f247e307a690845f0b1ff752b7bf4919a5b73381
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to redirect users to malicious websites. Heuristics indicate the PDF functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://3xlove.com/uploadfile/file/13399315222.pdf In PDF document text
    • http://highlandcougars83.com/clients/2/26/268573c5102cd00412bac87cee9346ec/File/1024652860.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/a203c018b47357d46c30da9539a607f8/52444019633.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/06f48acaec4a1390cb1f61a20b70c93f/siwalugubutemabar.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e3d2e9dd8---pukiwovuxazaparisizoxibex.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/00a492c007c4c42b906f89295ea172e9/dorozepojuzetodozeduwa.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/gatevasanefidi.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/30168365382.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/ffdafb29ec58210b595d1595a5d2c96a/wuvesisawujekanugadel.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/knvg0j27bm33rj4clb989j7at9/56179191139.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/6127362321.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/dojoxavituxevufinotup.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/99447490947.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/85756160ef40f4577cf694eb805ee361/29194040782.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/midizagovejalitezekopo.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b9de2c8124b---21541028978.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/b0ce76687e89bf3022337d549de502fd/dibenikuj.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/57227763764.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/28072008351.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098534980bb8---jefujibujolixino.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/20420909661.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/1du7ktcf0hu0hdcvbh0sl26k14/jogariranijusiwilup.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858bd51c791---20059817756.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/56b0ad9ff8b999ba2428870a5cfc3134/bawuberaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=answers+for+the+impossible+quiz+1PDF 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_off000119df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DF 17728 bytes
SHA-256: 2e364eb2afaa8e5758d787550774765d8a58e7a2699a09052a884d07d1809a05
font_01_sfnt_off0001488e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1488E 11024 bytes
SHA-256: 16daf12362010800952c2aad0935b9e0ff806397bfee968d7bb87f5ffbb3d37d
font_02_sfnt_off000161e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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