Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c246d517b715b6d…

MALICIOUS

PDF

72.6 KB Created: 2021-09-04 17:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 633a66fbdf89f3d3423cd15ba61a8ff5 SHA-1: 606702d90b9e76ebce62ffd1b0f8aea61d1b40c1 SHA-256: 6c246d517b715b6d19993dda114e9e748e70dba19c94b008cec4fe8184ef4a82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document, potentially delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://philabc.ru/uplcv?utm_term=similes+and+metaphors+worksheet+ks3 PDF link annotation
    • http://auburn-properties.com/userfiles/files/60619242117.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c35a3563ad1---giginezugofewesifavuzuta.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/0f996801afff594ef2401f351879d5be/97698293053.pdfIn PDF document text
    • http://goldmustang.ru/files/files/bibaz.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/3vnu72v38h71n7j6e0tf0eeiq2/gunulakox.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/zumofifogabudawufamofu.pdfIn PDF document text
    • http://broorybulldogs.com/clients/33993/File/23802507542.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607748ebcf138---danafedowumujobavixekoj.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/depipobatagit.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/f3b9c8d8717731063f7a044a4b7fb6f1/ditufumivewirikuvebipogo.pdfIn PDF document text
    • http://clingac.com/d/files/86017623449.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/63348862181.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/56435940831.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af90c29c1a0---64748370091.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bec44a0871a---vixod.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/btgdh1g23vt0nctnhpf8530u9j/fabunufati.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/92399814339.pdfIn PDF document text
    • http://coinmarketsuite.com/ckfinder/userfiles/files/lunijafegeromolewokapa.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/mixom.pdfIn PDF document text
    • http://p-jtech.com/userData/board/file/50509913961.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe45480176---vuwivo.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc14869c2c4---70899759183.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/f06cb41a0cd4e3cf3e69de14b4ef82bf/womezen.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/44447708140.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_off0000baa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAA6 11080 bytes
SHA-256: b7b69f582a87c17a55074ec4e0f6902b76f22122cf935b252ceb28ea3f852eeb
font_01_sfnt_off0000d44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44A 15852 bytes
SHA-256: 83d36cd48380f84b14cb27554f43c8c50f187ab068acf1515b1e6e1008200d38
font_02_sfnt_off0000fcdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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