Malicious PDF — malware analysis report

Static analysis result for SHA-256 474345ff2a57008d…

MALICIOUS

PDF

81.2 KB Created: 2021-09-19 08:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2c454b1fd33056b040413c5554b3731d SHA-1: 368ce5bb1402a4614cbf0850bbb715af72782356 SHA-256: 474345ff2a57008d4af50a116ecaf1021ccc944230c8183c9956dced5b1a3875
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the heuristic firings point to the exploitation of PDF vulnerabilities to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://marasintl.com/public/ckfinderuploads/files/fimaw.pdf In PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/40771494498.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/63757813474.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/62511617829.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/zuwikazeputuvotapibizej.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/99145149642.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142e960e5fb6---jaziwenefofejatexunaj.pdfIn PDF document text
    • http://huefpdf.org/upload/file/7277618883.pdfIn PDF document text
    • http://top-caster.com/userfiles/file/47685117015.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/12199187563.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/9a2a9c6deb3b2f4cd796a4fece61ecac/939077006.pdfIn PDF document text
    • http://takramaipai.com/mypicture/file/97258985460.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161452e92a98bf---bepowefugebo.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/diguwoxozawob.pdfIn PDF document text
    • http://konberdbio.com/upload/files/gafekejinupul.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/36093758473.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/68303893262.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16137c26b8542e---8378113212.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/56447857856.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/jutenuverubo.pdfIn PDF document text
    • http://rintoyo.com/userfiles/file/zixevesa.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/95974986677.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/jorajotovejelipevag.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/9b963df3dc5d75d33206a2b896acd223/23352685228.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/likizozibakagigejozedujun.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/87416153089.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=bengali+magazine+pdfPDF 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_off0000dbec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEC 10468 bytes
SHA-256: 97138123ab4b69eeda1a1abd0728ce4ed3641ef6ad8a0596bdae753b6e190855
font_01_sfnt_off0000f375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF375 16776 bytes
SHA-256: c9f70f990a980b57d28f6cbe1b1bc8ff6054c166cee8169a4988d90a451910f7
font_02_sfnt_off00011ec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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