Malicious PDF — malware analysis report

Static analysis result for SHA-256 b61680ff0aadd2f9…

MALICIOUS

PDF

80.7 KB Created: 2021-09-23 11:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a004e947fa57cbfa7a51906b201b21d7 SHA-1: 3e3777bafc3573d045fae4471566fd58b8d69620 SHA-256: b61680ff0aadd2f9ecbd6fc47fbe3620eec0942976f1c567be3b5cd45a9f1c98
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to multiple PDF files hosted on various domains, some of which are associated with compromised CMS uploads. The embedded URLs suggest an attempt to lure users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://18554080.com/userfiles/file/ditazotenox.pdf In PDF document text
    • http://mamitobe.ru/files/file/bokunimofotewi.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/91540583633.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/jqk1br9svck7fefrmiqnp89bqr/sewizufez.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b8f903a49---nefode.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/doseguwefupuwen.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/luvujis.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/21500616507.pdfIn PDF document text
    • https://protrialse.eu/files/files/moxiganiganopavemu.pdfIn PDF document text
    • https://activepymes.com/pub/file/74472497154.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/sadaw.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/vesasuvuxebegajikanelo.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/devepivawaxif.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be01ca362d---pinujikol.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/7316289022.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/79576557149.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/fawavog.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/xonimajo.pdfIn PDF document text
    • http://trivio.it/userfiles/files/54241070663.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/joronunobukokag.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/xekimoli.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/61983437781.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/revozejako.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/27304879086.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/16397592423.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/85202656745ed8cb68b6a2c42f88be5c/ralolojizegujogoru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=watch+grey%27s+anatomy+season+17+online+putlockerPDF 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_off0000d316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD316 11256 bytes
SHA-256: d3502e0e312c56dc7b98beecfcc195abccb5a3f3d5c95c44fa9c56c3607cdb39
font_01_sfnt_off0000ed7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7E 17396 bytes
SHA-256: da97cfabfc861c2523377f2ddfd40ba3fc1ec2ca80dfb153a0be7ad3bdb30097
font_02_sfnt_off00011adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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