Malicious PDF — malware analysis report

Static analysis result for SHA-256 927f1849bc6c9d37…

MALICIOUS

PDF

90.2 KB Created: 2021-06-29 22:23:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3e25a00ba9b3f06e55e83f75efb1e0b6 SHA-1: a504ecfb8c1503db4d5581644734676761f6afd9 SHA-256: 927f1849bc6c9d37b079aa9b68e6200b395690dab983d6c8a25a79368dba48e7
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. These links are likely intended to lure users into clicking them, leading to further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://architettoletiziamasciotta.eu/userfiles/files/sakadex.pdf In PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081b30b24fd4---3790618670.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085561d0a75f---38692373816.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/22510012761.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/o52otrk1lgdkdn08sqmhpfupt6/67604203449.pdfIn PDF document text
    • http://sillajen.com/fckeditor/_upload/file/69941652424.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/91253141282.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/6krkkl1cisi1q4dio3r0d04r67/pilikug.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c741f1d45c---jimikuwonorar.pdfIn PDF document text
    • https://actorconseil.com/files/file/nipolatodope.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/40ad113e4e3efc6883ad60982369a69c/10181770330.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/92785634349.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091752af0d8c---74990720316.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/15004427609.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/7c1da1aff36f4344139cda12ae000aef/pizekakazinoxojitevusijuw.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/83bc5c98a548dd4665c79592a5069192/97049955673.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3b4f692bd---jobajenosi.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/fitaxuximamiguwolirobemi.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/qp9uoc5e1abagrv4361ml2tco4/82072544127.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/l0mh71tsvdiqc1jbucndi1s4mi/fabinonagevanedodedeme.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f2fae6565---dikadela.pdfIn PDF document text
    • http://debden.org/userfiles/file/waputetel.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/wizuxanawuzawevejuxolol.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160858b18179b4---54873691998.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=java+initializing+2d+arrayPDF 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_off0000fcfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFA 10352 bytes
SHA-256: 115145c840a91e4e7e924475df306f43aa4d1a9c9e1efeb9cbb4e882c424b4b2
font_01_sfnt_off00011453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11453 17304 bytes
SHA-256: 72ca9a0df1f4ef050fa0016991690628d22becd481c63a638fb0aa5372ec3e2b
font_02_sfnt_off00014210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14210 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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