Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe959a55f247ce0b…

MALICIOUS

PDF

87.8 KB Created: 2021-07-27 00:31:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: acb8fcfe331eef9dbcbb6aac01bb1885 SHA-1: f1417f83d023c7b977e3e75e3a083427203860f5 SHA-256: fe959a55f247ce0b2a7250b9ea630fc093facfe25950c69b4817f977868f3666
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the link farm and the PDF structure itself are indicative of a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.abcklima.hu//data/editorfile/xebitupixotujitev.pdf In PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/4545d654f2e6ad03c1f5afc6bbdca017/83248058647.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/80283824034.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/50834230455.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/ki3nofsksbg4h0vjfkhfqu96tb/gutosujiwugirilumo.pdfIn PDF document text
    • http://suncreekpuppies.com/clients/8/88/88daaab1104cc9784d9cd8b59d189b35/File/29674293522.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/75104964079.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/am479uq5p78gfarigpepm8iubj/17520188391.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084054c81c8f---xetegutokaxeteg.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160edffa69501b---71675983275.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/153aa7c3d4bf172e8642879fecb8ff5e/dazuwajifenulatoruju.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/e5891f0445bbbbcd340e0024db923638/sulugo.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210609_04A38AD0041CD279.pdfIn PDF document text
    • http://rivieahk.com/clients/5/51/51325344bd1517f257d6959d5350918e/File/xunezikezojed.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/zipisajatuzegin.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/b872fda3905b7100333aefe16cedfdd4/baxoxobo.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cd0c7040f67---27970716634.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/296b0dc7bc67839b261f182ef7c1ea57/50131023277.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16086e97716e50---22014326275.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/cahvqtd9ubsmp8nrb7ffupk1q1/lawofelematumupepobeviga.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160740b3c41895---87615606577.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/74709052500.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/202169143835837.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7b031c94f---48912181376.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=lecturas+cortas+con+sus+preguntas+para+secundariaPDF 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_off0000f0fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FA 17920 bytes
SHA-256: 4d03f5e8b0f8ee3039076e942c556196df427c2ad4345cf81090b98ba1bc7a3f
font_01_sfnt_off00011e40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13657 10700 bytes
SHA-256: 4c964af5f72aef7f1ed51a29c377db1df9d35703b2db1750cc6f6fcc1b30f736

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