Malicious PDF — malware analysis report

Static analysis result for SHA-256 8202a3fb96eda2e6…

MALICIOUS

PDF

75.0 KB Created: 2021-06-25 15:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8de7bd8669d2b83fa76441df36f1e574 SHA-1: 7977d699a618f5adbfde6fe871f93a91aaf68970 SHA-256: 8202a3fb96eda2e607f30e4c12452a6b23a0d96e58142cb8db000cd5b8248d8d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • 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://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b21704db3a9---14804806756.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/so2m7vk44i5j96al2eb7m3u9ig/26172855988.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160727a9b23848---jafofumevisol.pdf
    • http://rollfactorytogo.com/uploads/files/37548538060.pdf
    • http://tantos.jp/js/upload/files/xugofunil.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/1202ab6a8a847c7fcf1040b0aeec075e/88672998182.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b633b7fca2---suradonozapugefijolifuwu.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983134a4b10---99546568770.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c8bbd43c8---fewexokavikomi.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/ddc56c3fac781937d2af6491ca4d246c/85909643283.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/088029b78edc0e36fba1248a8393720b/gazufebawutipawa.pdf
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/72e0e1877a602f81a9907aaf321bcbcd/78211343287.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160848d4755086---xasonotonevidoxinixozene.pdf
    • http://birzebbugastpetersfc.com/files/file/86425500048.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f9120b6397abbb587630da5f0df2c2e1/22173556521.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=cet+sample+papers+with+answers
    • 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_off0000c285.bin
3d1f2760e448978d84eb9edb0383f499a5839b0c55a18680bfb6570298842946		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC285 10512 bytes
font_01_sfnt_off0000da4f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4F 16792 bytes
font_02_sfnt_off0000f261.bin
c72324906432c59e06eb7ec3f0537a19effed20164f1a450706ff79370e2ca9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF261 16712 bytes

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