Malicious PDF — malware analysis report

Static analysis result for SHA-256 228d97f652db4c24…

MALICIOUS

PDF

82.7 KB Created: 2021-08-23 18:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 1a97fdd8928c724187525f920e6818e1 SHA-1: ccecef272453720bc2a03cb680f72d81eb2a34c6 SHA-256: 228d97f652db4c24e905cdbe6f1888d275d027bf86d3e51c7ab1c49259cce0b2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple compromised or disposable hosting sites, likely intended to redirect users to phishing pages or download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://bulongvungtau.com/media/ftp/file/11082374869.pdf In PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/suxojuzimemagumotazi.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/hhj82gtoo3bfome6r75dp403av/83225328588.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/gutoza.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/a7e817950f0a5e14f74ac2538938d1cb/92608295046.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/madusuzomokusowifose.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/816038093.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962ec665cc7---88686331368.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/27829633663.pdfIn PDF document text
    • https://rajaketiga.com/contents//files/jerul.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/momidukijekexadura.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/e469187e5f6e644429d61a17ef9cff66/xawagatazowilibamoxu.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/25aa813afd24b2bbba4dbef26b304635/fekox.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/291410398742.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/97642799385.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611a85e657b82---beboresifipumaxalawesizi.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082803a81ea5---34758289239.pdfIn PDF document text
    • http://chinoboxingclub.com/clients/36032/File/26228492771.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a467ecda46f---37481238710.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/paxexosog.pdfIn PDF document text
    • https://magatek.com/documents/file/tutilig.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/wusezojapamuvorateduforuf.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/95383006413.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/8917497953.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9d957b007---bifonixezibijeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+convert+acsm+to+pdf+onlinePDF 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_off0000e0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D0 16540 bytes
SHA-256: d4ad6f581dec4660c6b1cf26e91393962464e5a0bf338460dc90cd14bb189bbc
font_01_sfnt_off00010b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B90 10924 bytes
SHA-256: 5ecccb313662cef1ed68d00aa500aa2a7484be97fc04d835bbb58e10b8fb08c0
font_02_sfnt_off000124df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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