Malicious PDF — malware analysis report

Static analysis result for SHA-256 1280e5e9279d31f0…

MALICIOUS

PDF

82.8 KB Created: 2021-09-15 23:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e03d7b711be93111c967a06f07111683 SHA-1: bbca30da13d0dd81d0fa7bacd4f2366ec740ed7d SHA-256: 1280e5e9279d31f05a468571c318645804b85c0ef5cfb331ffc8dbed9a0e8a19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised WordPress sites and other domains, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of multiple external URIs and link farm heuristics indicates a deliberate effort to redirect users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=modern+quantum+mechanics+sakurai+napolitano+pdf PDF link annotation
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/towuba.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/51955090417.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/figebinafagitifozuwemude.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/95f012db8accfec25d418c3c110848de/bodudiwafisiwofimufevuset.pdfIn PDF document text
    • http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/zerukujita.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/28072191810.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/71296871587.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405d48b0c88---zixunejo.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/70707665905.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/12522575416.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f93219c489---sodavajurewavazaz.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/85300201802.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/faxanodejoda.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/nalawojepoduwufafujixozoj.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/fijotolulufi.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/kubewudavovalibefojib.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/bimomamojuxopudef.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/katinabutowofubaviludowap.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f610430fb9---kilavipokunawuk.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a678964b92---58449691307.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/fepezekobokevuwiriz.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/todigoxake.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/e61584cec284bf861895d505e6bd9257/6194819290.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/77125477509.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_off0000d930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD930 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF142 19064 bytes
SHA-256: 3304e85fee75eb4b98504f8de6e8602cd23b0776e7f06f06c76b35c2e48d202d
font_02_sfnt_off00012364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12364 11216 bytes
SHA-256: 721e856dc52a4dd887ea03b47ad1e0fdd4b2fe860a6ae05b9b777907117d76fc

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