Malicious PDF — malware analysis report

Static analysis result for SHA-256 73872112e52a9ec1…

MALICIOUS

PDF

81.3 KB Created: 2021-09-21 00:04:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: efab2a10ee45cdfc92f297f8feab2390 SHA-1: 4beb70fa7b8a02446f48cf6b3c76ca0c26e9fa24 SHA-256: 73872112e52a9ec1722da3d9e677d0b90144b1a97ca05211b95a2bd6e3811689
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure points to a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://oshcongregation.com/userfiles/file/83369383701.pdf In PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/8561669703.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/faufkeof877057lbu9d9acf6c3/piwuxobidatuketimapigepe.pdfIn PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/bepojekujilizifogepakizor.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/14520761759.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613693fc19da2---86920587019.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/10147323382.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/17169063292.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/24685075293.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/8856200433.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/jaxajupiserol.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/besiwufotelikexoliv.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79078299874.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/pizilukaludefesejir.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/watesubowe.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210910_90B16932421F1019.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16132ae8d7bac0---kazewanowitedanaxeniwesu.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/liribaziga.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/dg6c0phonk4u8cj2oqdohlo7f4/xejanusefudomesoluluzew.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/80375975311.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/94019982350.pdfIn PDF document text
    • http://serting.eu/userfiles/files/weverovemopizojur.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/dcd384e2b63d06d159160f541c5e5af3/kubizemixirerajidewalim.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/bobivaxamerurigawomagaw.pdfIn PDF document text
    • https://38e5bbdfe8be.gdziezjesc.info/userfiles/file/36978824598.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+change+my+location+on+pokemon+goPDF 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_off0000d976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD976 17244 bytes
SHA-256: fbcec218b3d5694fde61096ffed47fac97656b92828d603365be7a35031a1c7e
font_01_sfnt_off0001065f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065F 10836 bytes
SHA-256: 42b58d38cd3044c4b92c326117e987effb04bd58f590517ec57584279723f8f1
font_02_sfnt_off00011f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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