Malicious PDF — malware analysis report

Static analysis result for SHA-256 b04f7b5b03cfa468…

MALICIOUS

PDF

87.0 KB Created: 2021-07-30 09:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c207c6361a3f3d7ce8ff4b8442ef29c1 SHA-1: 77ade52d770bae98a2649cdcbad8fa598458fd3c SHA-256: b04f7b5b03cfa468d4cd4019f26b5bbf384bc7560a8e5fdb0b100f0dc3c93e4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. It contains numerous links pointing to compromised or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://queure.ru/uplcv?utm_term=birth+of+jesus+story+with+pictures+pdf PDF link annotation
    • http://merrygoldholidays.com/ckfinder/userfiles/files/93372223123.pdfIn PDF document text
    • http://geosond.pl/userfiles/file/33974868733.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9bd4770686---33137855916.pdfIn PDF document text
    • https://baglab.pl/galeria/file/fuvezakasabi.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160e8cce06c0bf---nevarumejul.pdfIn PDF document text
    • https://kham.vn/userfiles/file/maxidukane.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/8f0b89f2dea7a87ac585d8fb8bf2cd45/10924775640.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/29571403135.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/74838865299.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/77853d8e8b6aae32f29757b66ae2e139/51362270709.pdfIn PDF document text
    • http://geasit.it/userfiles/files/50466705149.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/fhgcv1j44ev39nqursoch6ilnm/35819709851.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/gevuditamojonagowif.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5361b751b---rivowigukupisat.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/48091564808.pdfIn PDF document text
    • http://bbbswalkforkids.com/clients/c/cf/cf8d0549bdc9bbdffca8bc0db9808b96/File/13536375236.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/janavevebawokozo.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/rofewajopixirosife.pdfIn PDF document text
    • http://zkpower.net/upload/files/susomidazutowopig.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/9f20913a5953fbe12f68cdb21f29a915/60914603041.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a9dcf120d---mamidigawotunew.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/16271994011.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ab77e8bf743---rogatuzotasapagasejovevo.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_off0000ef24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF24 17068 bytes
SHA-256: 7a43dd37b2a0daff1e2b5adceef7b13fb3836c2f5f5f24d7374be172dc63dacf
font_01_sfnt_off00011b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133AC 10888 bytes
SHA-256: 883f600e2ade14972afc8606377df657935e0997da196c730e7cb3445b862f19

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