Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cbbef11694d9ff6…

MALICIOUS

PDF

79.2 KB Created: 2021-08-26 07:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ecc315b984307e54db125dd474ccb2b3 SHA-1: 52509bd09e5e884bde09a20130052b0f8a949429 SHA-256: 8cbbef11694d9ff6955f8aa33b0068b33c5fc46db293734f038ef881aa2a43f1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains embedded JavaScript, which is likely used to redirect the user to external URLs. The heuristics indicate that the PDF acts as a link farm, pointing to numerous compromised websites, many of which are hosted on disposable domains or utilize SEO-related UTM parameters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://smidgel.ru/uplcv?utm_term=hotels+in+biloxi+with+balcony PDF link annotation
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/40114a144ecfab0127bd3147c3464d9c/34727812441.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/bnhhacbtb94hd4lvie9in3dpql/pesovejidujofoxivunu.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/f362cdcd55f9971554d5327279f78743/66091115901.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15552919327.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/7f7b74fec099d75116ad8b33ffedfaff/68183994779.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bf89ddf1e---kaxivekesowokovizupokoj.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/904utt2p31gonf5j9jpaoi08rl/87453563223.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/434cf33225cc109610f2f2d1043482c1/24737332805.pdfIn PDF document text
    • https://digireg.cz/upload/11591020890.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/74311698796.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63ce9239f8---27092493163.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6abd2765af---50605994926.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/9725089995.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/xupaxulogideboga.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/xezobozaviwekunejegak.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/dafurot.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/82485263828.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/romurusogebizapi.pdfIn PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/47350316912.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/fowitasomavide.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160af6cbf42756---xugimezigunoregiraf.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/duratazoxoboxadudekizaruv.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078eeebe87ea---67142598590.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/jejenujimudijuguz.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/b7ab8aaa8d7ca5ee754f61382deefdd1/napiradures.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_off0000cf39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF39 10660 bytes
SHA-256: 32b9021ab3e1a929ba489c7f0d166d493425ba648900adc74defe9cf4919e5a0
font_01_sfnt_off0000e7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBA 17072 bytes
SHA-256: 8a2fe33dc45652c1e617b834e743575e39ffe1e15aeee1bf2b946fc0d650382c

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