Malicious PDF — malware analysis report

Static analysis result for SHA-256 4580f7f91371f03e…

MALICIOUS

PDF

75.8 KB Created: 2021-09-10 07:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cfa7ac476ed026e859e8ea58893d34e8 SHA-1: 4a32a2f19ffe36eec76ee27b64da9110c9a37a7b SHA-256: 4580f7f91371f03ed09a1e953155570bf736a330a0a9139685359be8a0522f82
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be redirecting users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://catamma.ru/uplcv?utm_term=android+image+recognition+library PDF link annotation
    • https://soenen-pneus.com/upload/file/36961472018.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/17202914831.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/bomavewute.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/kaligivepezigego.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16135835fdd1c2---7356560599.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/ac832aa46b463b5a71091de23af90a81/39246795528.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/17429505660.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130282aef1f6---28900416275.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/77114360068.pdfIn PDF document text
    • http://santeh.md/img/files/pixenujefiruteji.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/xugujejipobinumadegeme.pdfIn PDF document text
    • http://gespk.com/userfiles/file/mixakemuvaxakoxesewir.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210903101805.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/pigesutevisirelozo.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/xulapi.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/75102295789.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/44456954111.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/81157886911.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16131a32a32ee3---batezusininazivivaripavik.pdfIn PDF document text
    • https://protrialse.eu/files/files/pukadusel.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16139f4da6f01e---jewamemutijunolirotebixi.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/46602441678.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0908/7575094f004685b8077f8d72e2694240.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/612ee18ccdfed.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/lufutejoge.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/tiduzi.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://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_off0000c521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC521 10780 bytes
SHA-256: 779351f30b89cf6a8f888f3b40e7119f27f96f643480513602eef8059d9f2ce1
font_01_sfnt_off0000ddb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB9 16880 bytes
SHA-256: e688a41cd2824a5b54a674e0beb8eaf5a9fb1d99a92d66ff5582a731806087f0
font_02_sfnt_off000109c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1