Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbc9b6a855b8c68d…

MALICIOUS

PDF

79.8 KB Created: 2021-09-11 00:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5afd32001871d47c3094dcb9b3c19ba9 SHA-1: 80c8a34d5ac60cd7535363160383f901e66cab83 SHA-256: cbc9b6a855b8c68d9c3278accc23fb728a1b06dc548e5ec480e827ea1c0ccc44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of link farming on potentially untrusted hosts. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted from this sample, but the extensive use of external links is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://smidgel.ru/uplcv?utm_term=batch+printing+windows+10 PDF link annotation
    • https://bodzlomu.com/userfiles/file/lamodenibumesarab.pdfIn PDF document text
    • http://zzquansu.cn/d/files/11777163774.pdfIn PDF document text
    • http://vswet.ru/f/susojaxuv.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd34706cce---vupux.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/saruwigogozupenenesinelo.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/nidevupiripifixupubalov.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/40492331262.pdfIn PDF document text
    • https://kitchensofdiablo.com/upload/file/wudozesefeforimokagoxa.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/gevifapuvezas.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/89264717647.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/dff1227c71c660bbda99e3041555a56d/94475797625.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/sowara.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161370de3ef2cb---kovejoxefilivadatofir.pdfIn PDF document text
    • http://ipayon.com/root/FCKeditor/file/jevuronepuserusudo.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613368970438b---88227327233.pdfIn PDF document text
    • http://prompol.com/media/file/36681095824.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/guwewigigir.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/lifegi.pdfIn PDF document text
    • http://ctm.it/userfiles/file/28420723218.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/94450544343.pdfIn PDF document text
    • http://p-jtech.com/userData/board/file/3752294709.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/70748044885.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_off0000d238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD238 17864 bytes
SHA-256: 91faefe799dbd59b668c921b8803b6fea05bc907b1fa1e97ddedb45973fe6a58
font_01_sfnt_off0001006b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11882 10928 bytes
SHA-256: 6b158a35be976ef1ccd860493f2fbed6aefc62ef5471e4e37387f59bb61eb101