Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a5188ff7c71adfc…

MALICIOUS

PDF

83.3 KB Created: 2021-09-14 12:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 251108ab0df8bb032ae4cb8a60ebda95 SHA-1: a148825b42f61910c5edc59ed5a1cb5e54f16df0 SHA-256: 6a5188ff7c71adfc30f0eebdd76f3d38767410b523d07eff9af0ba25fb0ab78a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting it's designed to redirect users to malicious content. The embedded URLs, while numerous, do not provide a clear second-stage payload, but the overall structure strongly suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://alde-pace.org/ckfinder/userfiles/files/rofupixaw.pdf In PDF document text
    • https://igraonica.me/userfiles/file/xugetire.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63612445928.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/29320966263.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/koxid.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a93e8ef90e---firudegel.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff98b22b80---64045249596.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/22264283233.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/zosozaguxesobedasevijono.pdfIn PDF document text
    • http://brlairport.com/images/file/rojuze.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/97100814977.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/lugotalovejizimedaw.pdfIn PDF document text
    • http://uhorder.com/upload/files/29063042640.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210905201126.pdfIn PDF document text
    • http://dsagco.com/Upload/file/29174316698.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/salimafefipewe.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a31d04a4e---90678030823.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/vofajixipoxuguwujewi.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/18367386927.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/gaweg.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/xorulabomolepupusude.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/78892266513.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/52856647798.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5b2adc817---29839699133.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=surface+book+vs+surface+pro+xPDF 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_off0000dfec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FE 18076 bytes
SHA-256: 0fd13bc6d9ccdce52e744b302a4532be86fcfb0e1906ff800a6fb025853efd9f
font_02_sfnt_off00012749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12749 10708 bytes
SHA-256: 3c865452036d427a7b761338f0263491b3e8f43734c4ad6c3a542953f518fcd4

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