Malicious PDF — malware analysis report

Static analysis result for SHA-256 f05519797abcbc1f…

MALICIOUS

PDF

82.5 KB Created: 2021-09-02 17:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cd44a096f0f10f9e3c7d518f5db3a38d SHA-1: e57e9b760054a3ac5a3760797c96c78d7188d247 SHA-256: f05519797abcbc1f9052b375f1d7aa6b2f78d508f7bc741b5fbe3c1882effdb6
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised CMS upload directories. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The document's structure and embedded URLs indicate an attempt to lure users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ffd9425fb54---41135756978.pdf In PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a637a7088---56013412928.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/45515029028.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/54122492431.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/25829156101.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/40952461595.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1624492207.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/u291q4j9llda2k25gdt80ioova/53004358930.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/sogipode.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/994fa4413a9caded59040af79af5e730/xigupizinapika.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/11706103332.pdfIn PDF document text
    • http://apcmagon.com/userfiles/demewabonaziji.pdfIn PDF document text
    • https://aromamarketing.md/img/files/28986494092.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9c64a6c5e---43836448817.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160cd639d09007---89017351802.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/76166600265.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/c7e41e06a6d4abd7394625fb698213a3/38985562336.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160d462927a630---nulexe.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/12136464654.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae37c1b0885---rilegitowegede.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16123482759d4c---kavakolugazexexi.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/54557746303.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/723e4408dcb8fce9e296aa5be367951d/pafokepekabepojogaxolipir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=humberto+de+campos+livros+pdfPDF 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_off0000da6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF281 10972 bytes
SHA-256: 2f33ab04245d10553db209ef1370c083a9d4a5b616e6ca7dd4a91715f307fb0f
font_02_sfnt_off00010bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC2 18552 bytes
SHA-256: ec5ab1322a7fecc695ccc016e8f9259e516c8dcd1fe3cef74e144f922b261afb

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