Malicious PDF — malware analysis report

Static analysis result for SHA-256 37acfe7996eb4ecb…

MALICIOUS

PDF

77.0 KB Created: 2021-09-20 19:42:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9adc6de23126090db0805249f260b300 SHA-1: 8b06ebf36343fc089f3b37576ef9c63c808032c3 SHA-256: 37acfe7996eb4ecbcc6ca76f390a7a21ae72d19f823200aee0e60727092de718
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to compromised WordPress upload directories, suggesting a link farm designed to host malicious content. The presence of these links indicates an attempt to direct users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • 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.
  • 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.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613fda402bacc---29155877757.pdf In PDF document text
    • http://savitaco.com/uploads/images/files/893794378.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/63392409610.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/sekipemarupajep.pdfIn PDF document text
    • http://scro.ru/pic/file/degonidunavepilewovoti.pdfIn PDF document text
    • https://allora-tour.by/var/upload/file/fukamaxapepekokajon.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210913_EB68E1B56291E353.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc6c77c139---69398220051.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/xarikijosimu.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/042c7643f87768364febf63245210fde/wofopil.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/95603441438.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133aa879e6c1---gerurusof.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/lalolalesikerim.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/41861625242.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/jufikakorep.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/f40eaf17lmphf99stoi07p3vv4/xexelefubobesujavupiw.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130319515dc5---29937795914.pdfIn PDF document text
    • http://xfswchem.com/upload/files/xuseferut.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-10/20210910183210336219.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/26342030168.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/61197120229.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nidadugeku.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161471f53e99b1---79305940417.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021091809454044.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/61474875320.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/45231539536.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=live+wallpaper+for+redmi+note+8+proPDF 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_off0000c8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE111 10808 bytes
SHA-256: cf76840217c27bd3122648c4febbebf2197c06af552f545fa982763fc64a4146
font_02_sfnt_off0000f9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FC 17244 bytes
SHA-256: 4904e6fa22a22ac0c0b125047e894e62a1eabe7e73ee5b3cd6bebdf1707ea482