Malicious PDF — malware analysis report

Static analysis result for SHA-256 84f430445c0ac9f6…

MALICIOUS

PDF

83.8 KB Created: 2021-08-20 16:38:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bc8f419c45ef4436b4e9609fae83178c SHA-1: 1d5b10e175c1c1c6a4e66666823a86f556aa2078 SHA-256: 84f430445c0ac9f6c75360142fefbd5aec3a9230025df6b5dfb493a4abf8a130
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to other PDF files hosted on compromised websites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://osakaav.com/userfiles/files/60869318500.pdf In PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/99a9d5672195c7f0c4efe3c2b3d6961d/kukelevux.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/88615192938.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/bebc343c452c92d1f8d53634d6212ca5/nosugojanevofokakow.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a1c16a858---wekikesufasasumenofuroji.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/xufanotukexalubokefusikom.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cff23ace658---fatag.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0f92d4280---buxejutodaminuzu.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/13705811022.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/61614452792.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7044bee7f---86610018152.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/6718435264.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160adb63c62618---64140048837.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b605d36e1---24084923470.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/59206553198.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/87576969049.pdfIn PDF document text
    • https://thietbiotoviet.com/Images_upload/files/75318209266.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1610478fd1c855---44378256797.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/7b7hda75a11p3dsg2lnlfufo34/31719472570.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/pimazulalejezidaran.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607943eabd4cc---xugisopemise.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce457470384---jidinexofixevulujujol.pdfIn PDF document text
    • http://aiken7050.com/clients/5/51/510ae66c864a6d23552e02d1b5190e2c/File/98705485948.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/wubasakobijuneno.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38f0056b83---kopobosojilusenasogofuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=can+we+transfer+whatsapp+from+android+to+iphone+via+backupPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/24c8b5fde0e6f2ccbd3f1f2870e389ea/javusimima.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_off0000e100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE100 17700 bytes
SHA-256: b9e5aad6b87004f5d6deb911324d98b3540006b3b114b2637d3120bb73f9c9fa
font_01_sfnt_off00010ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12604 11356 bytes
SHA-256: 5a0cd44478ce8ca45df3503506e32e57d90e8755064eb9c1d539b9365d76d5e0

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