Malicious PDF — malware analysis report

Static analysis result for SHA-256 fff5f98be8f69869…

MALICIOUS

PDF

77.0 KB Created: 2021-09-06 06:23:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 4a5e17ec9b3457ca1155b9da79534e6f SHA-1: 091ea67c7df6230405358d2d193cb0965813ddbf SHA-256: fff5f98be8f69869bf07c99d2075da8e95b8123e350a8a78b55a82bb34ea0f67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of numerous unknown URLs supports the attack pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://nw-line.ru/generic/uploaded/11580814139.pdf In PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/s984n2sqtkkr0mvukfjotss0t5/81426647816.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/fufarujusafoxejozalejume.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102fc707f0fd---32924490149.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/bemefegupegezoj.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/41242713915.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/fd3c370bf585e7826f24af5e518b20fb/32409700807.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/dovisulumu.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/c4f761dbb45de0ebe7189e105b3e479d/38985571273.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608b015a58c92---sabulatekuxeduzakomiv.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/45629375323.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/futirudisevesemowofadu.pdfIn PDF document text
    • https://shibbirs.com/media/files/nokovomuretotikujivugol.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/kiimd6p3vtdghrrf7eio12mu56/muvalewinewusoku.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160855eeac68b2---82146950213.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/penajoziwum.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/dg1ur2dumrthm4vejibfqdktu3/sozunebemop.pdfIn PDF document text
    • https://clickbox.ro/images/file/18614992888.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c30fa3a6348---89407333148.pdfIn PDF document text
    • http://zuestag.ch/userfiles/files/87283663392.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d59c439af1a---bebijijasidavibani.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/safula.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+delete+pages+from+pdf+foxit+readerPDF 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_off0000cc34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC34 10916 bytes
SHA-256: a2c86847d2b8b3d7770d45dbbf11c9df92034d2868586d62f0bb7d53178f8280
font_01_sfnt_off0000e553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE553 15848 bytes
SHA-256: 4f5e830beb1c96cdba8707065012913c33eb1b68bb206b7c2c7b5192ad7797f3
font_02_sfnt_off00010e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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