Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd0b0026a6677881…

MALICIOUS

PDF

75.5 KB Created: 2021-09-12 13:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2159dce2ffd791e5e03ab9a52407dd35 SHA-1: fdc5d0f1f19da5dd69931b5bcdbc1360af111c59 SHA-256: dd0b0026a66778814f59b52b821c7222671489f38ad0be1c3892032eec1b3f64
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of these links and the overall detection by security tools strongly suggest a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://anandamsanyal.com/userfiles/file/91827188586.pdf In PDF document text
    • https://tatsolarlight.com/uploads/files/tusipejusif.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/tokajodefegopivifupomogo.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/54984721858.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/78859496333.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/gizoruwewubamujirobiwud.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/93779581842.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/61353e17481fa.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/befagufodewize.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/tamepusamizinojiwofu.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/tabul.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/38e38a55d1a2a932094cebc0e320ba33/rutivagekumevuxifopawijid.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/60745795095.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/rikakakisefapim.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161383dcede9b1---7952690963.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/jafefoxe.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/rinojodowotuj.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/vinizulagalubizexoxugimul.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/20219101447575969.pdfIn PDF document text
    • http://vidol.eu/userfiles/file/sejikukonavurixujoref.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/vamanalemovugopizib.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/ditulokexukeja.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/768730cecaf220304b9cf64b858318a6/74192162214.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/4637479545.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=grappling+hook+mod+minecraft+pePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC273 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8A 11028 bytes
SHA-256: b109d7281ea5c8a947d223073996a3b99c4337b1637850237bd1878a0a3c52db
font_02_sfnt_off0000f3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C6 17192 bytes
SHA-256: 96f212fbdce1cebed14394672c427a12e4508ec54d448305e2a8f5beed793b49