Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a6a5704135a549…

MALICIOUS

PDF

87.3 KB Created: 2021-09-07 23:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d525236fa1e252bbb10fd138d25e1761 SHA-1: 38098cc799db6a6d3aa43b8066613fd644e46aaa SHA-256: a7a6a5704135a54930b1c79fdf7df092b3e3971991a185da38fd569bb8e576f5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to various domains, some of which are hosted on compromised CMS upload directories or disposable hosting. The embedded URLs suggest an attempt to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/51674813536.pdf In PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160fb9d518a393---bowuvo.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/07a877debbe81bec665de26f5512baee/lepukimogawanoxubaf.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9dc48d3e0---zunetokixesolawilekewa.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/41942584289.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/r0pgkg4mo37nriju069fvj32la/7006910603.pdfIn PDF document text
    • http://galgalesh.com/userfiles/file/zodunif.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/dazomol.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/63256840564.pdfIn PDF document text
    • https://chungangroup.com/uploads//files/202108130734408965.pdfIn PDF document text
    • http://aahsclassof1978.com/clients/b/b6/b6117739535924054831d33ecd54b00a/File/58874089360.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210613220826.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/8395564401.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/e46271369ae89c6a3e3d1b77df9f335a/24737591271.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/25453999441.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bd3c62a95---98404538068.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///kivuxekevatuzug.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/83733971004.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/86382415476.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608714009d45f---27978913839.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/nixapepetepedojizejiramom.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/2b6c1e1608f2e523ce60bd309e1fe4c7/bamizomuterapesiniduve.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/dibinubid.pdfIn PDF document text
    • http://lhs75.com/clients/46937/File/muxexutibinigiviboju.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/vabefa.pdfIn PDF document text
    • https://rintrans.com/files/rawomodudegafuseputebowa.pdfIn PDF document text
    • http://sanmargholidays.com/ckfinder/userfiles/files/95052231136.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=adagio+in+g+minor+sheet+music+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC17 18720 bytes
SHA-256: 1e7734833d4159885e3df2dc14db49586fa5c70e10957379fd6a7e4eb1bfefd5
font_01_sfnt_off00011ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F2 11100 bytes
SHA-256: 4622143fec73eabacdf93129ab9cd839df530851f83a92110a871734e61c5999

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