Malicious PDF — malware analysis report

Static analysis result for SHA-256 725b4536a3c8acc4…

MALICIOUS

PDF

82.3 KB Created: 2021-07-04 04:15:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7a9a24ea436b77a23bc9ca60786d8618 SHA-1: 3e526ec635ea71100b08b02bf8e2bcef07d5a408 SHA-256: 725b4536a3c8acc425078b69629519324055cbc10eaa52e5a2074f949f699263
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was identified as malicious by ClamAV and an ML classifier, and contains numerous links pointing to compromised WordPress sites and disposable domains. These links are likely intended to lead users to phishing pages or download further malicious content. The PDF's structure and the nature of the embedded links strongly suggest a link farm used for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072d53348779---zujapafobobos.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960c302b801---ledug.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d636484011ffaa9f3bec5a5a1f22ac09/34743291083.pdf
    • http://aarogyamedico.com/userfiles/file/80272968636.pdf
    • https://thegioidongphuc.net/ckfinder/userfiles/files/vemaxifedapivonar.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856c88519d3---82625030753.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607bad77702cf---61712502366.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/adf77f446c2b554f9cfaa7e3c00cb47c/pedesulezixar.pdf
    • https://vieclamday.com/userfiles/file/40941226770.pdf
    • https://corpusbg.com/files/fck/file/5901563227.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90a4dc77e---riket.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d8a29fcb424---89140938379.pdf
    • https://ludifrance.fr/userfiles/file/pazolimutunadogi.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/e7589c6fb962769b660b2e51f63cbbb7/76571718744.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b388479d8cd---terenafusulezesawizarugok.pdf
    • http://voijin.com/userfiles/files/90563403087.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/dfdec6916279c842bfc7b34a78cfacc7/relujupad.pdf
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/zudagoxakejeletiramuketez.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1749cc6d9---96609413319.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b81d5a97cfb---59163418185.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845fe50bfd9---xetofaxonajexevokokib.pdf
    • http://jp-photo.cz/soubory/files/gajojakis.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=chords+of+good+good+father
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd10.bin
74899ca30e5c39dd00120015936c88c85c86b97d1b384f78a166ab8cb8eae139
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD10 17660 bytes
font_01_sfnt_off00010c3a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3A 16792 bytes
font_02_sfnt_off00012451.bin
87d6ec1959c732ba62903b28b118f3eaa6f88343fb7508313b889bdbdc3c19fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x12451 10420 bytes