Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cfb1f2c093d024c…

MALICIOUS

PDF

85.0 KB Created: 2021-07-22 23:35:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: af882855fe3cb0f7c5a6a3a212ddcc2f SHA-1: e839f08c83a7ecc015802008b0dde476d41a6db4 SHA-256: 2cfb1f2c093d024cbb9bfbea1d5201fc3daa479432209d66bc42f7e6b543928e
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress upload storage or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://drairtools.com/ckfinder/userfiles/files/18865246670.pdf In PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecaf188e2c---32735305507.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/gojusede.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/630286501d440366ba2303dc9268a057/23988131859.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a26e42b29---18409336176.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/xanafawirajoje.pdfIn PDF document text
    • https://krossi.ru/images/content/files/xulobegofimofere.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/nelibijate.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a05e26847c7---jozobumeli.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/ff1e07cc62262c26b2113e1b421750fa/mujive.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/4cd550cc2bc83f7537a748bd7de462be/89937355371.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/97917932045.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/e8o9upajbj4cumq8jcmq41b3d1/jaferivepuxatuj.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/98365531798.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a59dbd349---sezakejoni.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/9b0e6bd2508231501c59bfe358c85a93/31025026290.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/44312235929.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/6059356321.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/kojasu.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa6f266f49---54698989460.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/28426110188.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/c9dd4f90ddcdfd3e006aec56c18f203d/dobokerovifoliletemisamig.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/53724858.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbdedb554c2---ripenamep.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c75569c487d---22684995048.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5bd9c697a---77809161895.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=i+second+that+motionPDF 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_off0000e915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE915 18760 bytes
SHA-256: dfaf34279f7909d8f3fdfe54b2c585a9e80830e180197f8b980e7909cce3b3c4
font_01_sfnt_off0001180e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180E 10440 bytes
SHA-256: d0f0c5cd51b18986ab1783d3e23a46643e2f2cd14efc646d12f2ef115c35cffc
font_02_sfnt_off00012f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1