Malicious PDF — malware analysis report

Static analysis result for SHA-256 83672fe01c1b61c4…

MALICIOUS

PDF

90.9 KB Created: 2021-07-20 06:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 1ecefd659e274b9d95a16a600cf884bb SHA-1: a6cd786942e2d918a76209987d0f013ee40c32af SHA-256: 83672fe01c1b61c4adc0d728fb3a14b5ea6c8ee777d14a0a8c5ebfd1ee513ae2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to potentially compromised websites, likely intended to lure users into downloading further malware or engaging in phishing activities. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the final destination and leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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://etabetasurvey.com/userfiles/files/vuwirosizu.pdf In PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/15208af473771f16c79db46dbe8ffcb7/jivuxijekepaj.pdfIn PDF document text
    • http://93564497.com/userfiles/73830420374.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b645994ccb---41421315860.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e91c4d8a280---sozumonagesizeji.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/fe5dfe4f42ab473216280ac93b78fa7a/99355580780.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d2dcf593b28---musogoj.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/ffad405fcff28bb3878491c1f075c868/39717209847.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160c8817e4824c---31475405058.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/62339459142.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16073562455d85---wusek.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098da545c67e---20981314087.pdfIn PDF document text
    • http://praguetransfer.com/files/file/24230775134.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/jonojim.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a587692598d---mubek.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/79818103276.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/f55a99c9235d710591cdf340fd43c60c/kigipurex.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b1e81ea5e4351959168a6a8221692b3c/pirelupedi.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/vigigirumalatabowowiselo.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/91907780087.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/3681366827.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210714_98ACA415E89258C0.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210531021541.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/7468648420.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/nugubofesezigitisa.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/72728803419.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=java+conditional+statements+examplesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AA 16520 bytes
SHA-256: 2dc62d46639fa231ba022ca69a4730e72191dd05127fe9da1f88c8bc4f5f7260
font_01_sfnt_off0000fc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5F 18276 bytes
SHA-256: 9b5b8a0b9cc2b86f99641f445c0552b9c43e7745845f66517144175c90f90514
font_02_sfnt_off00012cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB8 10732 bytes
SHA-256: cc200ef78ce64ccc0c54c0cbfbe943bdd465dd38203dff7c1fc4e4cd3013d028
font_03_sfnt_off00014570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14570 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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