Malicious PDF — malware analysis report

Static analysis result for SHA-256 15d41ac13f2d05e0…

MALICIOUS

PDF

71.1 KB Created: 2021-09-17 06:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b7f2bc4fc9b4f6ec288bfc090c377679 SHA-1: 3f888794b15ea38185119d7f0f68a77a76e95ad1 SHA-256: 15d41ac13f2d05e0aeed1c09a94798a7ad1057e0773d051eb466f7e49487498e
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution lure. No scripts were extracted, but the PDF structure and URL patterns are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://lesbambousbleus.fr/ckeditor/upload/files/33256229929.pdf In PDF document text
    • https://rafaellopezehijo.com/upload/files/merinezojotawusezesuwuro.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/jesunajutigiteze.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/735acf64b5ea2c0a2f31467a699868df/sizariwifajapoguse.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/piwanunudilerukavidure.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/gonudisipilo.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109170816371868.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613b471e8be3e---soludexajidutimajedav.pdfIn PDF document text
    • https://claudiodituri.it/uploads/zosab.pdfIn PDF document text
    • http://mlead.net/images/e/file/wilofazekax.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/jurazulirowa.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/mujuwikozidetufuwit.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/gozirivudiz.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/73800219297.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/12879769702.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/28651841398.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210914_B072E131829DE46B.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/rovuvoposaxazakeweloje.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210913_113702.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/gobuxipa.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/rawipijefapulumime.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613557a00d995---38137407464.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/sebojokowedefewofofemaza.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rawijevojaje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=2+player+games+free+apkPDF 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_off0000b7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7C7 10516 bytes
SHA-256: 1dc787f898ee57305497276aae6502df07b4974474e06d9e46911fc473bd1007
font_01_sfnt_off0000cfd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD8 15344 bytes
SHA-256: 0f67e6c1519f04a040b3d4b9286695556ab1a7d3c2a34870bb561f6c84beb287
font_02_sfnt_off0000f6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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