Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c34497b2f8f1889…

MALICIOUS

PDF

71.4 KB Created: 2021-09-16 09:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fef027ceb314e63efbdb29e475ea823e SHA-1: e4c6908c8db91d362a5142dda7bceeb5a2879914 SHA-256: 3c34497b2f8f188951321b0d9a4e71d556784703c862d68982234d1ce9bdaf09
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate the document functions as a link farm, with numerous external URIs pointing to various domains, including compromised CMS uploads and potentially disposable hosting. The presence of 'utm_term' parameters suggests a phishing or tracking intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://huntic.ru/uplcv?utm_term=notification+messenger+android PDF link annotation
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/16248375440.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/fopinuboberilasexukebiv.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/pujuxiwe.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/lexelozejozuru.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/tiretazazusujotikifep.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f855cbc383---vajepozi.pdfIn PDF document text
    • https://limsurdua.com/contents/files/wozujekakipexizivudovul.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139482811328---jatoxur.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/21417087751.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/jemaxafilivupademogatesew.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/jibupamid.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/57852568466.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/51617632741.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/17212185413.pdfIn PDF document text
    • https://phukienbep.net/media/files/fiwopavuwev.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/raviwurufatinana.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bc03b9d69---lafuwalulu.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/87499004984.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/towivinaw.pdfIn PDF document text
    • https://hongdung.vn/ckeditor/images/files/piziw.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/buzonezufaxilabigoxepaze.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/jepotezaza.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_off0000b84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB84E 10752 bytes
SHA-256: 64bd39e8cb1e445c2fdda2bd03e1b8fefaa5aaa4b3cd613f2a1c9b3bb26e4d49
font_01_sfnt_off0000d0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D1 15856 bytes
SHA-256: 398954e2203189eb26f5d1bb26568edab75e4b94727b0a6a42b5a94328591075
font_02_sfnt_off0000f878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF878 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1