Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7f298a4b734c1fd…

MALICIOUS

PDF

79.1 KB Created: 2021-09-16 08:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ded94c548856d393ea1cddad0ce78460 SHA-1: e475823b6ce76731957cce2af0750becd7eb98c5 SHA-256: d7f298a4b734c1fdf45045e82316cd10af72acce9b877a8b723596b32d5d55d1
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of a 'download button' heuristic further supports the lure mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://acupunctuuryao.nl/ckfinder/userfiles/files/78507906733.pdf In PDF document text
    • http://kahasat.cz/data/file/57008224626.pdfIn PDF document text
    • http://17njl.com/userfiles/files/musonara.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/79561131760.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/fulawidezedejoxebifun.pdfIn PDF document text
    • https://alummaswaja.com/yii/sdbalikpapan/home/images/upload/files/nesufulaxewarazobemetev.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/52167401141.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/rezemolutaw.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/pabiforivazoz.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/sofagarimesenedigula.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141669ac8183---16953997614.pdfIn PDF document text
    • https://anjingliar.com/contents/files/65198199820.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/11709538688.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/3f3b614159527df3bfd12b577c647108/fumubaw.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614124091de0f---10513614199.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/36989776730.pdfPDF link annotation
    • http://davidhammerstein.org/ckfinder/userfiles/files/kifovef.pdfIn PDF document text
    • https://ivanamihic.com/files/vimulolomu.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/76517608075.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/wazakalis.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/kinipuxizunamujalobakilix.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/84874370763.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=ram+lakhan+full+movie+hd+1080p+downloadPDF 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_off0000cbe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F3 18560 bytes
SHA-256: ce4547ae32c8b2e7372dd787f0d9df0ca844f3445ca057bb560005b674bca3e7
font_02_sfnt_off00011502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11502 11168 bytes
SHA-256: 2b857f8cc4785d4795a1df443f56f51e9aac1f9f7e256e683a2a32ba14bb30df

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