Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5b0285b88cab521…

MALICIOUS

PDF

95.8 KB Created: 2021-08-11 14:38:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 222ab8b865275795c579db05b8a1ed8d SHA-1: 0076589fcbf3f784e2b61b040142e719ecb5e987 SHA-256: c5b0285b88cab521008c506b5aa829dfc9697ab1a356522363a3feebbd8543b2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document is designed to trick users into believing they need a password for an archive, a common tactic to bypass gateway scanning. Numerous URLs point to compromised WordPress sites and disposable hosting, likely serving as download locations for further payloads. The presence of embedded JavaScript, though not fully analyzed, further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://ketchas.ru/uplcv?utm_term=maze+runner+correr+ou+morrer+livro+sinopse PDF link annotation
    • http://chaitraglaze.com/uploads/49806738058.pdfIn PDF document text
    • http://tiyuchangdi.com/upload_files/files/20210724_033036.pdfIn PDF document text
    • http://digifast.cz/userfiles/jeturekizizi.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1dff42a51---lugurejovoxoximefu.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c755bc33873---buvebalebofuka.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/2cbb0eff7efb4b06a968b8ae2b5d6344/netunibajirupemer.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/f1479efe91fa8064c84ae4ac2fd0b923/88716245310.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746d5ea5389---nobuwagobufowaluzatuwu.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/70514402042.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de9f959b1e---lawukafurotodatogilivo.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16074763f3891e---57516559317.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1b7d5f944---5473129633.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107762a864ea---33677377678.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe8c659304---vovenutitakodikam.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160afd06413d56---64863302168.pdfIn PDF document text
    • https://labelmarket.pl/data/file/tevurowoduvapaz.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/29450573780.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/56316910174.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/lusujaxovuvaxefikopud.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/sokamapibeno.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/botajidofuboziwizer.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/55512848543.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/5807ec5be476bfc6252b32acf69ca22c/41509801437.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/rosesozix.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/71276936096.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11116 10656 bytes
SHA-256: 1696b591c9b8d92a17e916802eaa5b5794b0688d494f98ac9ed7fe8cffab7705
font_02_sfnt_off0001297d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1297D 19008 bytes
SHA-256: 39811a18e6f4e7bd835f7d3bf6ac7b49e027c72dab6f5ca19db2071bca3f7f6b
font_03_sfnt_off00015882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15882 16344 bytes
SHA-256: 5cd8a120e106fc2d4fc1855603a636a3ce922decfb1b4d98f17a4a5450337c58

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