Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddf623cd21391e67…

MALICIOUS

PDF

88.3 KB Created: 2021-08-09 23:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: acfc9a4281050095238e6b3573dc32b6 SHA-1: 0c802e28fecf203f62774c3058aef218c033285d SHA-256: ddf623cd21391e67711fdece1b92351fce28b286f0175433700518beef8d25fc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised WordPress sites. The embedded JavaScript likely facilitates the redirection to external URLs, which are part of a link farm designed to obscure the final destination, potentially leading to phishing or malware downloads. The presence of multiple compromised upload directories across various domains suggests a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/c0e69d423ae2c019bf5d3d52119b7150/wozexide.pdf In PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc8837ded2---34681572319.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844002d3deb---jamak.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/c5c3834cf09adf97697e02e6695a862e/nipufizoduxujumaxobet.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/b21t3onesvp9ovi82n144897gv/mewarewebejusifojeganumo.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/36495975553.pdfIn PDF document text
    • http://ahchala.com/img/file/16021246675.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160983518435c8---fojafuwifalojexif.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/zasesilenokelugidogefamu.pdfIn PDF document text
    • http://czapla-dachy.pl/public/images/fck/file/81805598867.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/38793140711.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c93c1c352f5---8355707700.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/cd08ee66c9d4bfd4f30fe14b13243d76/41233734476.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/a09b261263fb7efd68720748398dafa7/xepafoseleb.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/3095d4097fdaf75dff08e9d471734f28/wakapu.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/xuruxawikefagejamojusus.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/tovufemoravinotupo.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/46277779716.pdfIn PDF document text
    • http://iqlacpro.vn/emotive/upload/files/68056275834.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/81453650134.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/72640665416.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/74762544505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=itar+compliance+checklist+pdfPDF 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_off0000f41c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41C 17392 bytes
SHA-256: 0466b16d0828f3076ccb97818c923105998dabfce9f00e90570b45048ffdb4cb
font_01_sfnt_off0001219c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219C 10928 bytes
SHA-256: 0b58bb57c64c43351e17c46a7176d7e99ec95f7e61dd7fee586c7fedbae670ec
font_02_sfnt_off00013abd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ABD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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