Malicious PDF — malware analysis report

Static analysis result for SHA-256 a16a0559f6277ad0…

MALICIOUS

PDF

82.5 KB Created: 2021-08-25 13:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: e6c56598d218fb1363cb3f7f79f0bf31 SHA-1: 4947804242f8d5b625d771386464296d548fc174 SHA-256: a16a0559f6277ad09dfcdb6b19d326bf2b0f78d607e7a9f04dca4528f84fe097
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cructi.ru/uplcv?utm_term=home+alone+2+full+movie+in+tamil+dubbed+download PDF link annotation
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/517603bc2d712e642872c6e25e813757/jojolenilupisa.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/19bcd6588832ed0263c152701f729386/pawapatapexiriru.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/wukubufukilatop.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210627164428_m2as2f.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/hqmv511e5d5nk21cvcebscmhq0/danefuregog.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ahr8asa9md5lj7f6k8j31n7b74/wogakoxak.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/jatejikubokoxosudiwu.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160eda9fddf7a0---83910720686.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/89781987514.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/xatedat.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/679b1b1de6121f43174fe588e688f8db/tuxanaju.pdfIn PDF document text
    • http://effektfilm.de/files/file/6330373592.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/nopobagiludiso.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/fativiku.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/nololofosotagikibivew.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/a730vqadhh03aeminct6fljv6l/kotovugepof.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/21802654431.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bda6184b8a4---39484341394.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d20c3c2ce---76905828288.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a38c14e0930---34411993326.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/9fa76a86ec65c0c886c302b292fa99a3/49745191647.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/b0b50418d7e188100958c14f5d8afacd/99483718955.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b21ace03c1---mobeliwofewimobor.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/5d4cc1e21052d93ef529df498136d7b0/jirajobamasuxexopenu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02D 16568 bytes
SHA-256: 21783d11a457d42441a27eaf7cf8967e7f09354ddad547060f717f02c034dc12
font_01_sfnt_off00010b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12339 10752 bytes
SHA-256: e854d2f4dd8ca24241c82e4f726c73d5eadb3a7b68aca595da2d30232a404457