Malicious PDF — malware analysis report

Static analysis result for SHA-256 16e74e400770164d…

MALICIOUS

PDF

77.6 KB Created: 2021-06-17 10:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: cf3c0bd8525d99bbf0c7b4220e585926 SHA-1: f0e64e88c759656213407ea691062cb7f97ef8d7 SHA-256: 16e74e400770164d7c2b12f4dd43c62c68794387bdc2a3e4303f05036366bcac
196 Risk Score

Malware Insights

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

This PDF file contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF links on disposable hosting and the use of UTM parameters suggest a link farm designed to obscure the ultimate destination or to improve search engine ranking for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://synerhu.ru/uplcv?utm_term=best+music+video+editing+app+for+android PDF link annotation
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb8e42fc17---69030221315.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2dcfef141---31198427233.pdfIn PDF document text
    • https://pubgpin.com/calisma2/files/uploads/23135313413.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/83628599953.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/f1364d8889c1c8c55cf94cbc08e90b55/213870089.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/52488145899.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/fojamixiziw.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/f88317a6bb2bd310b2ffd6d87c5b4eb0/76587880502.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a48aee473a---zukiposejimizu.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/ede8279ae32fe09b6f5978c6fdb9945a/78879014886.pdfIn PDF document text
    • http://www.heksan.com.pl/file/kajititekifazatixe.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160918298479b6---popizukalajarefavusonuk.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/nasapaxagiwijusovi.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16075f214b403d---filovakatob.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/uee1b5us961necsne117o19967/waxipotapujasowumome.pdfIn PDF document text
    • https://vansuloi.com/uploads/userfiles/file/14104605194.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/sezixidivedixadonomovuvi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF176 5552 bytes
SHA-256: e4b0dd00b5210ad9da65be20908cbb3fbaa6f52ca7f60807c54f25d4d3804ce5
font_01_sfnt_off00010456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10456 10936 bytes
SHA-256: ee65f214e9e4ff381c1ded7404744a8f3f8a483222a59fa1230e913db7581dfc

Open this report in the interactive analyzer, or submit your own file for analysis.