Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cba4d52b8b004b4…

MALICIOUS

PDF

97.8 KB Created: 2021-10-16 07:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6ddf8627628373c78373b1691ba81894 SHA-1: 0ad8514be038534fdbade4d526ccdbbac5a04063 SHA-256: 1cba4d52b8b004b43864ac816858c0127908b90628f69811143b3b4937bdeb07
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URI links and compromised CMS upload links indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://medvor.ru/uplcv?utm_term=electrical+drives+mcq PDF link annotation
    • http://duocmyphamcongty.com/app/webroot/uploads/files/30100985478.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/fizivonulamalarivon.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/gonebetozazinilarilena.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecabd5f4c8---24291055711.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/kasumulogopilazoga.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/24870013271.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149801daf89f---49211847645.pdfIn PDF document text
    • https://ulsantour.com/FileData/ckfinder/files/20211001_0199D89DD19F5CCC.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/75969988212.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ace08a1b1---18876250212.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/rafimoronesajezokosod.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/razujoxeda.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c38981202---85608909479.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1633277858.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/29061476237.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614397594ceb9---zusevixipogupur.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/20352067083.pdfIn PDF document text
    • https://purefeeling8.com/data/file/berojebodagosivufo.pdfIn PDF document text
    • http://orenprom.com/img/account/file/fotizufawazebativoxem.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/jalelififig.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16151b098e61e6---88178914572.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/rijifawiw.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb2d5cccb1---5164921170.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/winixepo.pdfIn PDF document text
    • https://galaxy-training.com/userfiles/file/tibafilixe.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_off0001155a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D71 10500 bytes
SHA-256: 01cb98a9611ff940c0b496f58c1fc8af52fc053ebbcef1cbb9785e40b5be6152
font_02_sfnt_off00014520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14520 19988 bytes
SHA-256: ba2761cc43da762d267ff4900f4fc264571d56b652143fdfe3ab8f953e4a36a8