Malicious PDF — malware analysis report

Static analysis result for SHA-256 711ebdce727041f7…

MALICIOUS

PDF

82.4 KB Created: 2021-09-19 05:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 18caabbc64661ca9cc83e3e8962024b5 SHA-1: aa58bc6c6e043aa40fad203cdb3d1ac6d38f197d SHA-256: 711ebdce727041f70410779f87e6fb525e7c2660f23c4085d9596494e6127245
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be disposable or compromised. The presence of a 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest a malicious intent. The document likely aims to lure users into clicking these links, potentially leading to phishing pages or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://queure.ru/uplcv?utm_term=gba+games+free+download+for+android PDF link annotation
    • https://kueapem.com/contents/files/defejemegupojizej.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/11186801800.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/suzunarimezotamulelonovo.pdfIn PDF document text
    • https://kulittelor.com/contents/files/marobutaxozadek.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/pugivogonu.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/30257731472.pdfIn PDF document text
    • http://15881588.com/ckupload/files/75461447197.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/pazepimisuvu.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/40017629669.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614676f3c2520---9518347574.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/39124319988.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16133123835ad2---pewosijowagusobupigafage.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/sigubasoduvafati.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/vamejuvunelipagok.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/52760339631.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16308944243660.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313c8083f57---88335424793.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/53800691036.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/wifimulotimuni.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/fofewi.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/42259303838.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/75391562011.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/86879963689.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/57604373040.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/ropugoropitexigurojiwom.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/pukotoxajejozofumu.pdfIn PDF document text
    • 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_off0000dbef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEF 18124 bytes
SHA-256: 97ff69956870d937ca02d0125544b47a77198196b779731bc78e04c06a14f465
font_01_sfnt_off00010a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A2 10864 bytes
SHA-256: 98073596939cad4861d7448df1f6591816cabd5497b90cf719860d8f5ddd3b8a

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