Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6f8afaeab992b28…

MALICIOUS

PDF

90.3 KB Created: 2021-09-17 00:36:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 70adec7ee135ca23ebd0543f60f5b778 SHA-1: ac95ac0958f0cb7ddcf47834e1d76d1cebe315c3 SHA-256: a6f8afaeab992b28e6090bb7dec80f5dad5d7d0c3bae14d1c9127d76f3aa378b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting a phishing or malware distribution attempt. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download an archive and provides a password, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://eghamatkade.com/basefile/eghamatkadecom/files/95065395315.pdf In PDF document text
    • https://shreenathtechnologies.com/userfiles/file/kijijiramobupudazagoxu.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/fuxilolidatuvafolixik.pdfIn PDF document text
    • http://ruihuitax.com/files/file/52878105092.pdfIn PDF document text
    • http://nessium.net/userfiles/file/74292259807.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/95668621586.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7dd902836---wojazadebuzitifode.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/51147542791.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/19689085529.pdfIn PDF document text
    • http://ltpbetel.ro/userfiles/file/41100727921.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/woxuj.pdfIn PDF document text
    • https://coil.hk/upload/files/mizugulikowenixofegalas.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a89860fb06---74905259834.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/95325787142.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/40464813287.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/purexojoxe.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/63668538857.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/12457877013.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/jokivafesikipomiz.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/wubapexudamijomosijimul.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/zofidurubexukuvinabivab.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/b39e1cd69b6f93965067d6c640ec42de/5721502742.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=battle+emote+ml+apk+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11D 10424 bytes
SHA-256: 33a516188ed6f5a5432636e5343c5f93c66f9b54f3c13c8025b3a660f8d765eb
font_01_sfnt_off0000f8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CA 17488 bytes
SHA-256: 76d69f3a729b1f1a319b97d816af623da6aaed050ac342b57ff2f54919a422cb
font_02_sfnt_off00012657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12657 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E68 18056 bytes
SHA-256: cd99ef74971c20f18f3f75e4efd8bf9104e4b5e1f5c4c58bf34a3eaa026b9e50

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