Malicious PDF — malware analysis report

Static analysis result for SHA-256 6be1ee9a1a3753be…

MALICIOUS

PDF

79.9 KB Created: 2021-09-04 04:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3e22137a4a7b61a646785d2bd604538c SHA-1: 1e855036897ad21fee58f308e4cc67ee082ce69a SHA-256: 6be1ee9a1a3753be75ad852e38841f39df510ff0a335eebc216420f3b12bcc25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external links suggests an attempt to redirect the user to malicious websites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/25978081557.pdf In PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/89238634742.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/gunovamebafokulafawutoti.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/lulozufuvisijer.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/6f26cfdf5700e3c5b6fb8a573ec38419/xizifunonukanukuwuzumazi.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074b7b6b9395---38079565887.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161115a18221ff---66938243655.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///74095252532.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/tiromegerevaxesij.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/92045200453.pdfIn PDF document text
    • https://seerupit.dk/assens/file/muxapasovi.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b0fdcf1a72f---56802704424.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210901_1D5287B609396460.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/mobojabexapuzode.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/zizexekafax.pdfIn PDF document text
    • https://avayemehr-carpet.ir/data/file/38416148124.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f17b06456---27756098034.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/29185321754.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/laxudarevifenuromo.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/pjsir0ih5kovfm96stgsmdrj9k/5914113342.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/37423048033.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/20385556465.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16129bc9056abb---35457315661.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f71adb9f1e1---37836381055.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/5f71a81425c410529ff5e1248a9c2723/seweginexonelipobugawunaw.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210602224842.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/lavagurelefa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=positional+language+worksheet+year+1PDF 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_off0000d280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD280 10832 bytes
SHA-256: 861421337d51fc9c07d91646e1ae92908ccfa3656507b7e846e00ccaf78d414d
font_01_sfnt_off0000eb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9C 18120 bytes
SHA-256: 600c163402b1851fdb3069ac6c582ff65941896de788a280072818a8bc04c432
font_02_sfnt_off000119ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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