Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bdd7d48f0c675be…

MALICIOUS

PDF

82.0 KB Created: 2021-09-16 11:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 454d2533604fc6f48e54334afb565b53 SHA-1: 24b7ea3568a45ace2aa835108ddb7fc8fdc56aa8 SHA-256: 5bdd7d48f0c675be1e74b7986dd541956e093c4ffff8c63417f67a73936d672e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://philabc.ru/uplcv?utm_term=best+ipad+tower+defense+games PDF link annotation
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161316bcdcc808---43045278285.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384b94795ed---baroritisukemavivelibe.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/xerobopoxabujasaki.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/tewelimovi.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/pemuwabeputi.pdfIn PDF document text
    • https://artedelvalle.cl/gal/files/file/20543802136.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/pegazemulukazedomuberukin.pdfIn PDF document text
    • http://vuadiemtayninh.com/hinhanh_fckeditor/file/dulafufovek.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210907_F6C55D6E76D8D3EA.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/31904102518.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/86793037094.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/45977558639.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109091025112393.pdfIn PDF document text
    • http://puebloexec.com/userfiles/file/99619704365.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/52199245183.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161329f7fc1dbe---44128162793.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-16/20210916065748381920.pdfIn PDF document text
    • http://jsdarvin.com/files/4930679187.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/lodelexapadiwitibadika.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_off0000d947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD947 18356 bytes
SHA-256: ef8e4b4b5c82dc7f829e8d5d10866c2164689b0d45464a8552277063b765cd08
font_01_sfnt_off00010972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10972 10932 bytes
SHA-256: 2ee9e393d9d62ee22f74880922cb57126cb8ae2e222313784b34ff347c7c2bfb
font_02_sfnt_off000122ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.