Malicious PDF — malware analysis report

Static analysis result for SHA-256 e472b3732771e76d…

MALICIOUS

PDF

82.8 KB Created: 2021-06-26 03:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 35a5f2bb8224ab0aa869970cdf0bc7c3 SHA-1: f494766cf746f72f71df6e9327447c66eaad34a2 SHA-256: e472b3732771e76da68beadd3f736e63257e9d67c181f8b2eaa8d8d73bcbcd33
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 uploads 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. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ohappy.org/userData/board/file/nesobuwofuru.pdf
    • https://biocoils.com/img/file/nopidilovov.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb61a4e4e0---76838549196.pdf
    • https://roweryelectra.eu/app/webroot/uploads/file/16199786305373.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4254a5590---28806378066.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/0d833f1e0ad60f52644a5bc6b0dfdf5c/tefew.pdf
    • https://chrmglobal.com/userfiles/file/tuximekagefukorudavurifan.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/0plu8uhqvkho2hbsl7bas8n5n4/86525332275.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/446950da7f262b2dfccceee03e4737b4/44418514492.pdf
    • http://aapltd.net/userfiles/file/nobanojupuro.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8a98f01c6---50832104211.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdb1506593---noderifofesuxedogepijadix.pdf
    • http://dighakanchaninternational.com/FCKeditor/file/mafenelurujutajo.pdf
    • https://gw21.ch/uploads/userfiles/file/6590311785.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/sjvrcbab7e7d8oc94dkrjcts06/86968359651.pdf
    • http://gymostrov.org/gymostrov/userfiles/file/newekulur.pdf
    • http://esipro.lu/userfiles/file/keveladofukalugawokal.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/9903aa801e5aa4cd50fe7642fde9309a/52578030004.pdf
    • https://akapacha.com/userfiles/file/79495752507.pdf
    • http://imailbox.nl/images/uploadedimages/file/dufabozatuximixobigijus.pdf
    • http://3e-machinery.ru/app/webroot/filesfiles/jepiri.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607578c70086e---tujakujuvetafewajudoxog.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/0db113d0c3fc97c1c2b29f097def94e5/mezukukagikatum.pdf
    • https://fwullong.com/upfiles/editor/files/64964953960.pdf
    • https://toromecanicorodeo.com/files/foduwivokoguzod.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=class+6+computer+book+chapter+1+question+answer
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df91.bin
207fd273337f756502b18d9e68a62c2968c61b2dafaad38789f1fd2db48050b9
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF91 16496 bytes
font_01_sfnt_off00010a7d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7D 16792 bytes
font_02_sfnt_off00012294.bin
7f005eff03a4d9bec08f1e273364190c71b4605f4a34974ed60d71be822c45dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x12294 11452 bytes