Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ba013cd96a7ce70…

MALICIOUS

PDF

88.3 KB Created: 2021-09-17 01:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 86f4238f89ed8d8430e0908a03d42f75 SHA-1: c1a61c2cfa359d450806866a193579b41cc72cea SHA-256: 4ba013cd96a7ce702d8770c40252f9a5673d4f3b393a172083c63538f82d7fc2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ibnuaffan.com/ckfinder/userfiles/files/79997895380.pdf In PDF document text
    • https://negaratoto.com/contents/files/kizan.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/f4574000bbb90d40dedf2aa4383c3eaf/42369367416.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/96095851880.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/gagigelobopilu.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/zunarutixesivejexam.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/kogelebajopewodugewopifir.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40567702939.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/99119264669.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/db9hkerfpqva5bks4sqmoljll0/fototudogode.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/44871376515.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/76731689313.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/32159316150.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/525819923.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1613f48839a099---sanevedafenatata.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/20222073900.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/67857959652.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/nojelalakumijape.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161398f34bd423---32686058650.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/161323c61a4ad1---jetegipapem.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/regawalivodovizofur.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/31576467848.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/6e6ceccb652b438ef82b1d4b91850821/siparusibezo.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/nekiwunurewugezidid.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/zumelinodil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=yowhatsapp+apk+for+iosPDF 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_off0000f301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF301 18780 bytes
SHA-256: 980cd95ac1525311ff6ba1c479fea0d7f3ce40bbd80f555bc6a96f4f01e002c9
font_01_sfnt_off00012431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12431 10336 bytes
SHA-256: 267d0f37c456cbf8b0ce8b3ad1d0370904826c55007e7beb273d4220ed84d0da
font_02_sfnt_off00013bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1