Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a9ac70de166d5b1…

MALICIOUS

PDF

155.4 KB Created: 2021-09-05 02:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d6af1a0a8f7bb0cb191ab8208289d5f6 SHA-1: 645858fcd29b92b699a7570c1acc3ce198d27947 SHA-256: 2a9ac70de166d5b1f7c3087572cbfea18bd24954e205bd2a4a5b793425fca9d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics point to the PDF acting as a link farm, directing users to compromised WordPress upload directories and disposable hosting sites. The presence of embedded URLs and the nature of the heuristics suggest this PDF is designed to redirect users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/kvmgpn9rhf0ev5v3ghrol9rt9k/99830696171.pdf In PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/af7itfli3t2j59e1oppqj9ej00/zupinugizasuteki.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609abf98a3849---kabuxawagujixubavejik.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b6707d378---samiweteves.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/givuroxasesivixa.pdfIn PDF document text
    • http://gojjang.com/uploads/files/7662001884.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/k521tdlrsmctiktjpu2rq1p4ui/kovipobimusiredeg.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757cd6d746d---29540184745.pdfIn PDF document text
    • http://palami.by/images/file/gowukegetibavaguduzadeg.pdfIn PDF document text
    • http://funperm.ru/content/file/9637328999.pdfIn PDF document text
    • http://sentralperdana.com/file/kosowisiwukasunateg.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/qe3srq5q11q18nhk67g6u4kbgv/20539513250.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/16272271132.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/zafofifebunawenuzodifomo.pdfIn PDF document text
    • http://trendymamy.pl/userfiles/file/26723743075.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608b02c89cbb4---genarikapapove.pdfIn PDF document text
    • http://krcatikyonetimi.com/userfiles/file/rikosarame.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f080a65d1---36622991293.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/2607649791.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/bepudasasupazavorosupo.pdfIn PDF document text
    • https://timminsrenovations.ca/file/YZdGS6ZKlbSikIMb.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/62452739278.pdfIn PDF document text
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/uhpf0iaa5rllo2jtmtfjko8t4i/rekejipuraf.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/xakibanowiju.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607081145ee6a---dajotideratepomot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=consignation+maritime+pdfPDF 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_off0001f72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F72C 20972 bytes
SHA-256: 088a78c81fccd02ffe9378a301d6a81ea7406c7018a8e770b5dbccb839ae92fd
font_01_sfnt_off00022cbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22CBF 10828 bytes
SHA-256: 084e9a8af72c72dce876a2d16464d1509969387814799fe79807ecb30c1486f1
font_02_sfnt_off0002458c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2458C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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