Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b5f88ae0667ad09…

MALICIOUS

PDF

89.8 KB Created: 2021-07-07 00:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 85065329c900e72152da1892904d09b6 SHA-1: dd8a231b35bc03358778d34c65b8c5cb75ca1e71 SHA-256: 0b5f88ae0667ad0909b2c6eccb82f2437bc218b3c56fecf45dec8524168ee9db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of embedded URLs and the PDF structure itself are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://huntic.ru/uplcv?utm_term=solid+domestic+waste+examples PDF link annotation
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/8d925c6073a2f2c016fa69a4ebc32e68/gusigedinujolasixupoge.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/96e2e6c31fb1a8fbad0ae7ca4fab7a1b/gipodukukulipivol.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160707f6fb8bb7---76246661544.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/22676401140.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd4b69784f---luzajewerideradurosot.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3d833f8aa---52726433225.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/faludip.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/jovewazaguwejezukutinini.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b6899d7b9---38507230608.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/lojigikijowikabavad.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/kegopeduzapuxunomewoti.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/fuiqtau77tn7airivilcl9vj05/64251211777.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/36372515695.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/53267716366.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607946ce9a0e1---67320990356.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/585378170ff4795ec2059e2ffd55ffc2/lufizitonodoburaxodeveve.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/2021751215155007.pdfIn PDF document text
    • https://victorybear-info.com/userfiles/files/zuvadesikatotekaweso.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16080faedb6bb4---titilujapotaruneluw.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c5821841517---77641835987.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc383922e5---2773780618.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/ae41ba73fb75ce0da245c6f1976c5aed/kamas.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/1bbu70v6dvn0gnfh3qemg90bnr/99968956229.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160911c5f95283---mexomexube.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607e70e13bb09---sevasitogojax.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_off0000fb3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001134f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134F 17932 bytes
SHA-256: 216b60e3eb34c85f883ae30347db43766376dc29b82715ff9f61b62fa0829b19
font_02_sfnt_off00014172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14172 10736 bytes
SHA-256: d36eeab7602a18f186f8c670e41894de99a40f9ecbd82f70154c9bc3c24f85ef

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