Malicious PDF — malware analysis report

Static analysis result for SHA-256 a54f1b71da988574…

MALICIOUS

PDF

73.7 KB Created: 2021-09-14 01:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 14a44f88e5510b16872fca30a47909fd SHA-1: 83cc959bbeae8a5be30102be4646144de8efe019 SHA-256: a54f1b71da988574e4388bd23a27ce3601d8d9c5848d0b3090548897cfa77a15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by a machine learning classifier and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate the PDF acts as a link farm, directing users to multiple distinct hosts, some of which are hosted on compromised CMS uploads or disposable domains. The embedded URLs suggest an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://bahamianbrewery.com/ckfinder/userfiles/files/xoviberedegugofiko.pdf In PDF document text
    • https://factorysales.com/userfiles/files/kupurepugemefav.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/kurakitirexiperudelijis.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/xogaxejopu.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/maravim.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/85339363395.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/veliweromotisaga.pdfIn PDF document text
    • http://premiercontainerlines.com/media/ftp/file/nupigukututibuvefitubewo.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/bodavomitimal.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/datepolume.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/zunonenorokasefewoxifo.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/21969501600.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/12117318124.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/11992136031.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/313c7d9e650f09a55dfb2892552ca06a/sosutimetijajubo.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/98132511dc25b69c78bcb3c7ddce2b11/jowiwaw.pdfIn PDF document text
    • https://12tiga.com/contents/files/lujapabogekedijasur.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/midazipaduxororefujoluve.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/41377907509.pdfIn PDF document text
    • http://stattus.com/assets/file/66274886857.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/gabuxusetuzijewe.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613d99b10775c---13685724678.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/majugaxatugozajukuwe.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/40842354051.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=sonic+battle+apkPDF 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_off0000bc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC38 17488 bytes
SHA-256: 48d11cde0ec5b2dcbcf07569157076cf8a6d62fa1e708816b0c239b5371118df
font_01_sfnt_off0000e9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C8 10408 bytes
SHA-256: cdfab74c25888180c1a043f3d8c543a07fbc81f8df18ee42e41f7935af0eafee
font_02_sfnt_off0001014a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1