Malicious PDF — malware analysis report

Static analysis result for SHA-256 191d31d6bc8d8b04…

MALICIOUS

PDF

93.5 KB Created: 2021-07-08 10:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 524d23e3dd66fcc75d4c8a80fd151111 SHA-1: 438e237a4cf1885491ed37b22d0b1401e832095d SHA-256: 191d31d6bc8d8b0460830bf11a82e43fdf4b83a3f6baa842d0a18a9945cde0da
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised CMS upload storage locations and disposable hosting sites. These links likely serve as a distribution mechanism for further malicious payloads or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://leavereview.com/customerinterview/ckfinder/userfiles/files/pajivodulazawiwuvego.pdf In PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160826b19bc8cc---35105618913.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/biwivara.pdfIn PDF document text
    • https://limsurdua.com/contents//files/46606676034.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/21599479361.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/5656361eac2f76382698f637b64996b0/69862149802.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/me1bs7ajm3ph3udtrej16mj633/38230850210.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5711c9ccb---zasenesegulumoz.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/1f3d65dfb0b15b2c3acb75064b20ad41/49051245425.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c2fc4a377---pusibixezejas.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc11d00361---nozelazezipabu.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/a78ae054d16b606989107fbf3a260af0/fimemi.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8855c2862---duxukodufewivavozufiron.pdfIn PDF document text
    • http://greenld.com/userfiles/gasiwedagowuniz.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/pelitibagimum.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/janedekawoxe.pdfIn PDF document text
    • https://umartravel.com/files/40868212810.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/bvd50vp0j9pd100kcsanllb0r0/57143595709.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/lhlqb2a7vf73856ifls0d98pi0/lifewomosu.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccea76c5f6---tomoni.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/2f9c4591b2751d8409925f7fc5c093a6/67342559311.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/531e2e637a57590b08f6fb1fc580a1d1/1017013244.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=step+dad+and+daughter+dance+songsPDF 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_off00010d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D60 16528 bytes
SHA-256: 1f41cbe9e923b43141e5fc5bc71dc3e428995ece8122aa23e0c106fc89c25c29
font_01_sfnt_off00013833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13833 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001504a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1504A 10832 bytes
SHA-256: 6bcece300d1e44a4f276230a605b5f1c8edd450e4f47d50001f6deed946d4012

Open this report in the interactive analyzer, or submit your own file for analysis.