Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8eb913e78e78fba…

MALICIOUS

PDF

143.4 KB Created: 2021-07-05 13:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8ff36690abdfa50351a080d38798b14e SHA-1: 62ac0bf3f072a588f8fcdba9f07e8080e4a917ed SHA-256: d8eb913e78e78fba1f554164657688424eac7516e7057aa3b976ef936b003244
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://huntic.ru/uplcv?utm_term=unsung+after+7 PDF link annotation
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff87429ac3---24404043313.pdfIn PDF document text
    • http://briarcliff70.com/clients/874901/File/ridetipagitopogoxoto.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092722a6ffe3---nosewefupurufigotijuga.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/23105827762.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca2fc8d949e---96341232955.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/5aadf9b5ec0c5c067e98cb557b925c73/97053239093.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606f36042e8ef---63045351791.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/utal3c3i1sqofma360rgl5u1p2/47451893353.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/kuvusupijitifibapone.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/zamav.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16b10a1569---27742084307.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/d5ba779375b46bebfa14d333658f3022/69278728571.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bddc35070da---mozogos.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/ce5329ff88641225af6c802272e0f479/luvesixugop.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbe7d48444---97083599366.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/54708365063.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/49180803845.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/b117ab26bb591fddba8771bee93bae6d/jomilot.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903737bd404---pokemiwikizorow.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a5be71b61---22566584229.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/ludalumekebodawifoxa.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/23006996587.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_off0001ce02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CE02 18664 bytes
SHA-256: 0c2e264a3990fefada1079cdcb1704b0ce9b85e8c39b6da6c6cf7c9d4eed3b19
font_01_sfnt_off0001ff68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FF68 10288 bytes
SHA-256: c6518afb50df03ecd85a4ee16543d19dd4650949a4a0ecefa02605efd9976f89
font_02_sfnt_off000216c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x216C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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