Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c6f32640b715ac6…

MALICIOUS

PDF

87.3 KB Created: 2021-07-25 11:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a92de7c9030a8946b138e9e1f841d6ce SHA-1: 66389078bdd34e66fd2b7aeb414bf772d04315a3 SHA-256: 9c6f32640b715ac61d0fd926d9f1cac7692b3456b399e46b2cc67a19428b2dff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links, many hosted on compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple unknown URLs points to a broad campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081ec5235308---guvudabijapazemaxiwapeva.pdf In PDF document text
    • http://dui-antidote.com/images/userfiles/file/paguvexefonagewutusozo.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/fasojukijo.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160fcb200df056---77218925683.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/01dace8880e9e97bba1569eaa0b446c7/82217161933.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/tosamunavamesulugelovi.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/qfaaan6salntu3s527sh7fsv4c/88395534650.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/96813903056.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/ravefududuxara.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d8a203e21---wesumegekopadojoke.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/tidenesi.pdfIn PDF document text
    • http://graham1978.com/clients/79565/File/kumoloximokidosasim.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cb81933e2---fadovulexomavanimakab.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/u88q3cpra1jso3vk60kncq69su/44721619664.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/buzipojuvatomenilusumo.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071e44514bc5---banewuluvomotojokabanopog.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb60a414f83---82022013223.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/zewuseperoregosusudidu.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/wevaxusazunafeduwi.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/50427732389.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ee30ad88620---82687632073.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/sixepazeluxatunelana.pdfIn PDF document text
    • https://medtek.vn/storage/file/89001966924.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=photoshop+elements+2020+tech+specsPDF 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_off0000f22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3E 17164 bytes
SHA-256: 89965f9a3b5de2499bb7da78e53548b77ee934ecb8fee8a10247693abda0f37c
font_02_sfnt_off00013728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13728 10528 bytes
SHA-256: 8380e27c0a364a081a446cd08b9e1dfc5ba1445fbaaf45e751b1ae4ea3f0d9c9