Malicious PDF — malware analysis report

Static analysis result for SHA-256 478c312c4a2f2725…

MALICIOUS

PDF

81.6 KB Created: 2021-09-05 15:28:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d092d0b6d10471e6f0fcd629563b140a SHA-1: d22f47b0ff0d5c3945b70388a9f803ac7b3e7407 SHA-256: 478c312c4a2f272552f06135a2772f9f69e9fafe7fe36b4e8c2f630e2c6b235f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to PDF files hosted on compromised CMS upload directories. This suggests the document is designed to act as a lure, directing users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://philabc.ru/uplcv?utm_term=335i+auto+to+manual+swap+cost PDF link annotation
    • https://gastrotest.co/ckfinder/userfiles/files/redikigabazurenar.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210609193318_918481815.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/terupirokiro.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/tnkb1r47ugqtae7akje14ddsp4/51279907788.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7d275ca61---58433018025.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/77172419661.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/11769887259.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/pebamenikoz.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161300cb934c44---xewitorefo.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c51b9eb3e---16256454491.pdfIn PDF document text
    • http://trieuduong.com/images/Download/18850122669.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607224cc5179f---jozazorekadelakukegamusax.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f66e674cc---vamurobalamojo.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607852fe0bd0c---55325656203.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/fazorobemuwarixa.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a03b17b517---18232062071.pdfIn PDF document text
    • http://poorclarescork.ie/images/50689649621.pdfIn PDF document text
    • https://xn--arbeitskndigungsrecht-best-5zc.de/userfiles/file/42081037498.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/30607387145.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/b869b2838e2113e55d0b1a4fc367aba2/86164381799.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/fikutaroboletelabibijamav.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/11387543373.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_off0000d646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD646 10700 bytes
SHA-256: cfbb229101aaed1345c1883dab0aa9d4bc57eb0bf73bb064ef7a8cfe38a7c758
font_01_sfnt_off0000eee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE1 18660 bytes
SHA-256: c1284df3bd57636b41b6dde1ef8efa193486df740789e9015e812b034052b2f6
font_02_sfnt_off00011fb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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