Malicious PDF — malware analysis report

Static analysis result for SHA-256 adb9c57d24e5c73d…

MALICIOUS

PDF

80.0 KB Created: 2021-09-12 09:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0165a675ec8deaaa078d4fc1d1071e10 SHA-1: cc353249455c5d8f1b22b66e7dab57a79a3d77b3 SHA-256: adb9c57d24e5c73df682183f25090eeef0b07310a749e7e761403d65c6927416
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, some pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery via these links. The presence of embedded JavaScript (T1059.007) is a common technique in malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cpsguffanti.com/uploads/file/demuxituzixubedometamijo.pdf In PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/69272022879.pdfIn PDF document text
    • http://elitk.ru/_files/53461649073.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/nitepaxade.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/36414173390.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/34967036674.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/24268569165.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136274021bfc---wagezabetigobulin.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/17722247174.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16137949648a3c---56246921572.pdfIn PDF document text
    • http://pk.mo/userfiles/file/mikajelof.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/xegoj.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/jasalotazofuvabed.pdfIn PDF document text
    • http://esejsc.com/upload/files/senudiwuxolijizodaso.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/zilofosebozokuvam.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/xobeka.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da4d9850c4---34525166577.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/47914020772.pdfIn PDF document text
    • http://hidramaco.com/files/files/92324823232.pdfIn PDF document text
    • https://ubranni.com/uploader/files/bekukolovitaveviw.pdfIn PDF document text
    • http://127.0.0.1/bantraicay/js/ckfinder/userfiles/files/ziwojujatasaremegaf.pdfPDF link annotation
    • http://oldmotorsclub.com/files/file/xenupotumunibifasalilatef.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/xivosijowuj.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/20500430710.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/87028973165.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=pokemon+emerald+xy+gbaPDF 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_off0000d2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AA 18180 bytes
SHA-256: 976defdfd42e54b985cc1ca9d1b405889084de8ce5e16f4a5825b685efa6cee0
font_01_sfnt_off000101ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FF 10684 bytes
SHA-256: ebea5eac10e7d301312a6d98ac065d539702d5b293d381669933f5bad32a9822
font_02_sfnt_off00011a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1