Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ad588cfddd84536…

MALICIOUS

PDF

70.2 KB Created: 2021-09-25 02:07:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 491f33b726da22d42bba2919265ed704 SHA-1: 0da9f42917eef4071d2d3a394c57845f6fb8c0a9 SHA-256: 1ad588cfddd84536737dc5bb2b2e7a4df5698d515e34bc8eb97ef46f4bf94f91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs that point to potentially compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics further supports the attack pattern of redirecting users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=prize+claw+2+mod+apk PDF link annotation
    • https://gullyracing.it/admin/ckfinder/userfiles/files/zegetis.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/voxorapisilerapume.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/zawom.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161455b33c5d82---tunolotoruwere.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jomejabufonemofufisetu.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/julig.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/161470f9008e95---37839363973.pdfIn PDF document text
    • https://ccichn.vn/data/upload/file/bozozupixegituwaloveta.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/93174375866.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/30932395312.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/vofanijugutav.pdfIn PDF document text
    • http://xn--5dbfbdrd7azav1bcx.com/sites/default/files/file/67381329792.pdfIn PDF document text
    • https://fultoys.com/userfiles/veniribivuxaxivamafirog.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/xuvalizokedebume.pdfIn PDF document text
    • https://emenu.hu/editor_up/77425191137.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/11803103720.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/6030145634.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/fodebutosunifi.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/59185026978.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210914130920.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/kusiwujevutumaziwenukiro.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/80425156716.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137294b8bb98---mumafosezatimewaz.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/922226602.pdfIn PDF document text
    • https://durimawar.com/contents/files/vapakob.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_off0000b174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB174 16280 bytes
SHA-256: 96b7c08862711b63ebc30d497c21f4499ee54a778ab0a3ccf4bee8a5ae2b92fe
font_01_sfnt_off0000dadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F4 10664 bytes
SHA-256: e34aadd39088190f907f6a4e0382e6f022e55083820d48838091b756d1141d66

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