Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ad317f654b0d942…

MALICIOUS

PDF

85.4 KB Created: 2021-09-01 11:19:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ec020752d0be5e67b7f93cf8053555c6 SHA-1: 22db144ccf9268ee54a2bf0b48dd7a2ccf49bcb9 SHA-256: 4ad317f654b0d942f1e555c9a2335c2ff5192d618c457935f8b08a22089fb90a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, many of which point to compromised CMS uploads or disposable hosting, indicating a likely attempt to distribute malware or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious dropper or phishing lure.

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 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 http://stlnsk.ru/uploads/file/vavep.pdf In PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087357c6e0c5---noroxunu.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6fb66cd823---nulopebefominaxupe.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/bd50285e5c85138bfd21d4a4b570c995/satomubepaj.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/68b64bce86ef9c4e22d0e1fb9f426427/xolulezadan.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/sukubajozaka.pdfIn PDF document text
    • https://rajaunited.com/contents//files/jenekovobabiduked.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/milodomadobudegefo.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607beb281e277---86438532534.pdfIn PDF document text
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/51313471325.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/5q8ibsmtdfq63vr7ke71nvqi23/93587558042.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/befevazarasagilujedajuvom.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/molufafebanujix.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/fagejo.pdfIn PDF document text
    • https://panama4d.com/contents/files/58927104482.pdfIn PDF document text
    • http://princeverma.in/uploads/files/korujij.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105101033.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/68568602496.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210820_130957.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/22877682881.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/qeorh4qf3nb56c2e4hopdktfrr/44679558778.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786298e5291---kipesopuxavetosilo.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/6g2v2jbb7nc00t6oc8c0mlg7n6/fatun.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/7163630866.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=flick+of+the+wrist+meaningPDF 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_off0000e84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84E 10936 bytes
SHA-256: 92fe42681349e29d0f68c72e58fec4deaf84fdb5bdb2be7ecc746c5a6a212eae
font_01_sfnt_off00010191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10191 18080 bytes
SHA-256: 0c981f3d98e62328938f66459ffeb11f96badaf09e61ffbee37471c56f1c35a6
font_02_sfnt_off000130fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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