Malicious PDF — malware analysis report

Static analysis result for SHA-256 a776582da47429a9…

MALICIOUS

PDF

89.5 KB Created: 2021-06-26 17:43:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 809e673ddc3eb9d525d4ac47c0287a2f SHA-1: c2c3320c2e42a495e80e0102b614fae0d10df411 SHA-256: a776582da47429a9760f927eb643a380b8f115a7b593546c9e763a069fdb538a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://superchills.com/userfiles/file/25105653294.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/lafafoi0t4oq6ci0enrql8it33/vagekogukibopupuwanoju.pdf
    • https://123natura.com/stockages/files/40737795936.pdf
    • http://omg.su/upload/File/2482345314.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/ved0r0mfpgkuvfkcar1mlpo1r0/fetiwafamuxuxisaxivisemoz.pdf
    • https://jobtiara.com/files/files/3556583110.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/b24a9434d6398e53f552d1e7e0404962/93172835018.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/tal8u77neql5oq6ft0r8sgcod1/1755098081.pdf
    • http://peaceinsrilanka.lk/userfiles/file/gasapaguk.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c479021cbe7---gekenuwadasizafurixikotas.pdf
    • https://autoteam.in/ckfinder/userfiles/files/23485833410.pdf
    • http://bettaletroom.com/file_media/file_image/file/39338962264.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079aefec0521---21215448790.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607409b8b63b5---61705035401.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/06f07919d4eb8e48a5a3d2ed4464d2e6/xerixenisukarigunafepuka.pdf
    • http://wenxuezj.com/images/File/fagepopawowonizurizomodo.pdf
    • http://cpils.com/userfiles/file/fuboviwawuf.pdf
    • http://rurisnet.org/images/file/50932503198.pdf
    • http://www.hangmandigital.com/files/file/49371534654.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830df52324d---xeladofefuxutomegisuf.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/d4839cd117f4e36edd5d01f85b03edd9/23739803494.pdf
    • https://clickkedai.com/userfiles/file/deluwipidil.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff817b3107---67616141516.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=understanding+and+surviving+martial+law+pdf
    • 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_off0000fa86.bin
c0a3c5f585005bf3ffeb2849f705da16cd0bbf40eff22f267ce53de70191a7a1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA86 16928 bytes
font_01_sfnt_off000126ea.bin
1dca61e5a1e6ac1a7b7837b9e466395ed4a32a39efd2a750510a3b37332ac24a
pdf-font-stream PDF embedded font (sfnt) at offset 0x126EA 10980 bytes
font_02_sfnt_off0001403b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1403B 16792 bytes