Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3d6a80096f302b8…

MALICIOUS

PDF

88.0 KB Created: 2021-09-19 00:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c49b5f22d812f2d640c290c8f7c8694b SHA-1: ea2e67341e0a5ba5e36ee2f89b70a9906f6d07af SHA-256: f3d6a80096f302b8b0b002e57d735df2e3945f8143d9faa9494edd6563faf00e
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting it functions as a link farm to distribute further malicious content or phish users. No scripts were extracted, but the structure and URL patterns are consistent with malware droppers or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161436fddcb5d6---81311511184.pdf In PDF document text
    • http://www.fuchingrading.com/upload/file/61004802647.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/46297025831.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/18134105719.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/83644509882.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c56272a0a---19709789853.pdfIn PDF document text
    • https://wineart.online/userfiles/file/81971103212.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0901/ea3b462ef6feafb6011aa5387a0079df.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/madaguvegexa.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/doxikok.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/mepegutidin.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e6f6bd671---42459295063.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/nuatg44cgf674d26vgmagklcrq/87176385425.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161431bfa52978---77344891774.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/vubamamatozet.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210905_30572B6C6BFDD40F.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109150745251744.pdfIn PDF document text
    • https://grancom.by/upload/docs/ranixubunogufudesepuzipo.pdfIn PDF document text
    • https://sainaudit.mn/File/rowilosajewesakij.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161410e99ab555---59434313490.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614448b94d1a4---texekirowu.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/98102655447.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/wupatugibob.pdfIn PDF document text
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/26124483473.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=naruto+shippuden+84PDF 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_off0000e4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E1 23444 bytes
SHA-256: 77e2604ebe8aac409865dd78de5224e42755c509b8226d5ec2d36d2725b0a229
font_01_sfnt_off00012173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12173 10804 bytes
SHA-256: 1563d24c053504a39072ffdc369b6f9d31a234db4ce4bf96621ab7292fd7c5cf
font_02_sfnt_off00013a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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