Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f6b584b350ee636…

MALICIOUS

PDF

92.5 KB Created: 2021-06-27 02:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f223450ea0df0dc2eed0d67068bfa082 SHA-1: a854f2de01363f09cf96a565e1d88a45783525e4 SHA-256: 9f6b584b350ee6367dc9700bb217b294d16ed07cd6cccd4b99c4b69ef36dc05f
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://farmstead.tw/farmstead/upload/files/62683290396.pdf In PDF document text
    • https://bojovicsirogojno.com//files/wagiruvawarepunokurofagar.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/77562955289.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/0da1313617490a712f528419a8061dcd/67825728535.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/wavazoxukof.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/6505223a0bb571a77d9b7fd38a9ad339/66522547940.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/7345caece5ddf92743d1e04a537ad77e/42379695752.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/ebjs16h3iih174d1sga6d4p6i2/tawewiwu.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3df271b0a---jujodufafoxire.pdfIn PDF document text
    • https://inncredel.com/uploads/gikuru.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/xisusobazezug.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/goporabisonebevoguxukefot.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c4785563a---37329468137.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/ab5a7a3308bc5de5143c0d0698c3be0d/66246841769.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef8ccaf523---motosuxujefeminado.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/mukexapurefidovud.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/v00f7ftrg58ild8v339omvahg3/lizowukawunofuxigawira.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/ash9huf0dbm955c1dlm0l74k82/satavenodoletoja.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/46514642373.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/2c625aa0f755bd71a4076c18e404590e/74457223581.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/fcbbf60fd686138009022a7cf233243a/88211868763.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608edcb17ce65---33102279143.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc9338cee1---tefisu.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/hvtmcic1f28hn1ajlma7n3d4l0/28830810816.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=suffix+of+suitPDF 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_off0000ef43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF43 18944 bytes
SHA-256: 4f097698eef5f44574a28a3eb879cf909a2ac6a0564c8fab9e35b8d522d25a0c
font_01_sfnt_off00012046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12046 16244 bytes
SHA-256: b1ef7b52ed35dfd01120c19ee4193d967dc828f2fc549fe1a2d8c3c5029b4647
font_02_sfnt_off00013632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13632 9940 bytes
SHA-256: 9555567136cdec93d3b85836b472bc2cc7a0acf8b043eff6b118f6f644cd3e67
font_03_sfnt_off00014c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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