Malicious PDF — malware analysis report

Static analysis result for SHA-256 889fcb8abf67b41a…

MALICIOUS

PDF

79.7 KB Created: 2021-09-04 05:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2cfb854ee09caba7eb14b51804747ec6 SHA-1: ef45d016b9a53ce82139cf543845658e95750c24 SHA-256: 889fcb8abf67b41a288073c1436e494224da7fb6129fc2186a6d71b9c4f76a43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous URLs pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to deceive or infect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://wastran.ru/uplcv?utm_term=cadmio+en+cacao+ecuador+pdf PDF link annotation
    • http://szjg.hu/images/file/jititibirokilulap.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/3cead7e73d9624e73d2ec120d58b81b1/samagitawoze.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/xomimaziv.pdfIn PDF document text
    • http://greenhousehotel.vn/uploads/image/files/kiperabekoda.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/fukakebiluwopuw.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/94837722059.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612000b7c9dd2---18998328068.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/24815446755.pdfIn PDF document text
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/luzelakowixaremikenobi.pdfIn PDF document text
    • http://tjtvina.com/Upload/files/10561459807.pdfIn PDF document text
    • https://wasael.com/userfiles/file/luwap.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/petolomedu.pdfIn PDF document text
    • http://ktcz.eu/files/files/2722609173.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7321507e3d0fad2b2c97d24db13931fc/poganivunubapobulimudi.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/9bb1bb0f0fc0177af05f2d237c34a203/81188485906.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vetokafalaxozinaki.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4caedf373b---18755312502.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/16975878381.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe194ca07c---91229669125.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/poxubijifepazarepofoka.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/korojalifemujonemas.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/72463576741.pdfIn PDF document text
    • http://belean.pl/userfiles/file/winekixedefa.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1607b440f7ee19---risisi.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://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_off0000d595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD595 10600 bytes
SHA-256: 17aac467f280d7fbf54c211597149260b691cea30d53d657611178baf026cbb0
font_01_sfnt_off0000edad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BF 18768 bytes
SHA-256: 95e1c2c5c89a4a72510ddf253c33f9bcd67090de5d1362814495f0eec56f33e1

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