Malicious PDF — malware analysis report

Static analysis result for SHA-256 303956600e193ae4…

MALICIOUS

PDF

72.3 KB Created: 2021-09-27 08:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 246add8705275b1f0a86d206d6922a4f SHA-1: 96a22a64add654ba00c97ce3a7cd3026872574c8 SHA-256: 303956600e193ae422f251146aef722230d41017dffcfa2b7fffd2ce5d9423b6
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://garglob.ru/uplcv?utm_term=assassin+archer+modern+day+robin+hood+mod+apk PDF link annotation
    • https://www.sistemkabin.com/ckfinder/userfiles/files/tatepijim.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/13200321346.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/juxamifememozagipi.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/35935594458.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16151327c9081f---72228677833.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/161444f8dedc9c---bunoguvugis.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/sizibiwu.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/ca535758788090143cd93656eaa23782/91179918811.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161303facbb729---38246445612.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/43314212590.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/9a2c067e81ba50e8153cfb1ce1eaaad2/82852193124.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/vamuvuxoxofubiwigub.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/81677843824.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/podomuvufanewerilorezunak.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/lagogefexufakel.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/86789322843.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/57050604909.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/6bd13bb477d40d3310fae4a980a8eaa3/batefigikedudi.pdfIn PDF document text
    • http://z500.si/files/lowifiweredogefaxiruk.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/82123307848.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/61131259301.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/2913573583.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/45530231597.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-9-1/20210901104541719463.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_off0000b2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB14 10964 bytes
SHA-256: 99287bf2b03735de089b21b163429da63f9baa00116600591e186b73566422ae
font_02_sfnt_off0000e418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE418 18092 bytes
SHA-256: b44f85795e2b93bf8389aee61b40bec7a4fce5066b2c94abc564a3524820020f

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