Malicious PDF — malware analysis report

Static analysis result for SHA-256 bca14635864bd59f…

MALICIOUS

PDF

83.2 KB Created: 2021-09-10 22:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4a9a624187b55ff9866bd0d6639cf323 SHA-1: b695affdc96bd642e2df990f08a7eec2f26825af SHA-256: bca14635864bd59fb829f032bef8dc5dc06cfa41a5bf7bc5575d5ed40ec93bde
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but containing embedded artifacts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://pixomot.ru/uplcv?utm_term=how+to+make+a+live+background+iphone PDF link annotation
    • http://ubytovna-krumlov.cz/userfiles/file/resoni.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/jigiliragowexanekajuvikuw.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/mifamoredotiwexefoxim.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/vamujedikutamepabenofag.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/tm3krt5nc8dblvq7pjnv9tqec4/24400757506.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/sagelovokerupavu.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/dopumobajijejemibe.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613619e6c2614---gaxelokugexisa.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/lobepe.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/a3720ab6f0c9c6aed22ab3136444073d/vofuxomaxap.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/43651783344.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161326e71284ae---72357018304.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ijgph0rdnt9v7j9bjf8o27u718/3316278550.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/xipokufujewizenesagobivaw.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161325bbfc4738---51513757604.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/74826738579.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/jojopumazak.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/bcde1c7b4fcaaa6ea1c73bd95e7a307f/60561558624.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/20943258755.pdfIn PDF document text
    • https://heyratacademy.ir/file/73023145206.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161375c0dc5e03---20226384558.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135fffa196ce---wapinokipuv.pdfIn PDF document text
    • 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_off0000ded2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED2 11268 bytes
SHA-256: 002c772d6e675430465b6320b68aa48474cb12c0c3ff72095a07875dd874023e
font_01_sfnt_off0000f8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B4 18000 bytes
SHA-256: aaf574b9deb30ff7323bb1fdeb9f76480607c3eea9c33db1bbda214c1c626a73

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