Malicious PDF — malware analysis report

Static analysis result for SHA-256 bce4164abbdfbdde…

MALICIOUS

PDF

72.6 KB Created: 2021-09-20 08:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 520b15dd5243c564a3f5425d9167c597 SHA-1: 0e6356c970bce5807cfed44e51f2fa31ef098b3f SHA-256: bce4164abbdfbdde91ffd1eac56a8ad08167d6f86e9080ffa8b35f598cc70ce2
176 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF contains a link farm pointing to various URLs, some of which are hosted on compromised CMS platforms. The presence of multiple external URIs and a link farm suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.vnos.vn/app/webroot/uploads/files/bafatojutalivuletuf.pdf In PDF document text
    • http://smartdeal.pl/files/upload/files/xojesinorogunozanatixel.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139dba733022---zakamoxipatapo.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210917105425700.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090607124141925.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/23727916073.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/30982000741.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/q8pern2ipr2ggsq4ljnm5pp8i1/64893497392.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be087b924a---renuzot.pdfPDF link annotation
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/86189620004.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/butalisefopaxevuduvafu.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/balepemasilexeji.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210918150103.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/semixexela.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/sakenuwa.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/170738315078.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/dee75be8f8c230e48de3be1ae567a042/pojogu.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/zuzevobixijigitetaf.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/35203169000.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93449201475.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/12776385794.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/99860492796.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161400f13182ea---demosavaripuxisomozob.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/161479b0f5c64a---54561868544.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=minecraft+1.16+download+mcpePDF 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_off0000bacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBACC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E3 10980 bytes
SHA-256: 75099833a232b99f51b39ee5d581e1d730267f33a0c49372fdfc0b5dbafe6abb
font_02_sfnt_off0000ec76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC76 15968 bytes
SHA-256: 199c5bd898b69533eb4049f735a8a3cfb107e74cc5bc1653952e39bfc9522bf2

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