Malicious PDF — malware analysis report

Static analysis result for SHA-256 c94b157703941a10…

MALICIOUS

PDF

89.4 KB Created: 2021-09-14 20:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7ff40a4847c775e26f4cb2d1f451d054 SHA-1: d95e695785a66b59247d027ca0f769da8500e08d SHA-256: c94b157703941a1058ff8db6fdc37df372e8ea4692db45e4890d2548e401a568
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple disposable domains, with one URL specifically referencing a WordPress upload directory. The primary lure appears to be a 'media player for Android apk' via a Google feedproxy URL, suggesting a social engineering attempt to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://status-go.net/gfx/userfiles/files/gagesaxa.pdf In PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/neligajene.pdfIn PDF document text
    • https://pastijptoto.com/contents/files/duvefilogefaluxapanobuxi.pdfIn PDF document text
    • http://vecsecity.info/editor_up/41306083646.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/78657065449.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/76129398754.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-9-6/20210906043310872675.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/32557250750.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/3805743161.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/24475483001.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137781661197---96946401687.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/bunut.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/98660636579.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/sopoxesobol.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/botamilotijakidipiva.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0b7c5bb71---palulutaruxugiv.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/lakujaleru.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/balibuzimolozez.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/venumibukesorirezomavolo.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb07c731ac---jifutiluzagaxex.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/25434763710.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/notelafemisumivenirir.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/bonapeperozoxi.pdfIn PDF document text
    • https://paramourpourbebe.bettygagne.ca/userfiles/file/gaxotinutet.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/56129756082.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=media+player+for+android+apkPDF 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_off0000fbea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEA 17212 bytes
SHA-256: aba09d72622846dede0ddbf99395114c59241c89f96dfb4976c17af462d89f18
font_01_sfnt_off00012849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12849 10424 bytes
SHA-256: d01791c56a3bc37c01529b26ee7c256ca4db721c679ed03942ac3944288c1105
font_02_sfnt_off00013ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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