Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6929549be6978d5…

MALICIOUS

PDF

81.2 KB Created: 2021-09-18 21:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: af131062bbef2eb8e02415bb445a8a25 SHA-1: db389808914b174ffef444f782f58dda1fa14550 SHA-256: d6929549be6978d53656f711e9115175ddd2dda3d43d51b884de591206d61f15
196 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to various external URLs, some hosted on compromised CMS uploads. The 'SE_CLICKFIX' heuristic confirms a social engineering attack that instructs the user to execute a command, likely to download and run a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://inwebjor.ru/uplcv?utm_term=how+to+take+screenshot+with+note+10 PDF link annotation
    • http://thietbianninh188.com/uploads/files/tevolonidadofo.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///12681289648.pdfIn PDF document text
    • https://combrooncom.com/contents/files/66990800465.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/877314060.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/bezupilavejug.pdfIn PDF document text
    • https://irantruck.ir/data/file/65276635723.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/deruvofakofazolotu.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/62548778000.pdfIn PDF document text
    • https://akemi.ro/hirek/file/begiwodegipekejubofozij.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/wenib.pdfIn PDF document text
    • http://xtra360.net/campannas/file/nipaxibapadeteda.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/14399097495.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/pekerironowiduwisafegezu.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0c22cf2d5---nowuw.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/1b000nggsf61hvioiqmku2ld3g/donefutidose.pdfIn PDF document text
    • http://edallyshop.com/upload/files/19300830234.pdfIn PDF document text
    • https://limadelimon.com/images/file/retekubojutalamedonutoxa.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/57542370402.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/pural.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/28298624723.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/kazono.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/69900546096.pdfIn PDF document text
    • https://rais.bg/uploads/file/dadifolitigumaj.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613d42c50f660---88578639581.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_off0000d96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96B 10624 bytes
SHA-256: dd466bb789791ae323ca0550788a212c7256c8f46f05dc4a597d2b5c481e7d7f
font_01_sfnt_off0000f1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BF 17436 bytes
SHA-256: d5da803fb9da4031a5107210b9dc18f761f68859ad68c3606f9205a337968d68
font_02_sfnt_off00011ee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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