Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7a75ec923d2c7ec…

MALICIOUS

PDF

75.5 KB Created: 2021-09-17 19:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a4cef731e60c28a1482f5b5adde4d202 SHA-1: ce33fcead733b5a1192bedc69084e10c7ff7cb75 SHA-256: e7a75ec923d2c7ec2bc1e843da072aafd225645941eefe67c1caa896d56f28e1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs that form a link farm. Several of these links point to compromised WordPress upload storage or disposable hosting, indicating a likely attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 http://www.insight-assessment.com/ckfinder/userfiles/files/33933859017.pdf In PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109011818542709.pdfIn PDF document text
    • http://nessium.net/userfiles/file/99114917790.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/dijofu.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/50361668117.pdfIn PDF document text
    • http://simoncaulkin.com/images/gevusajodexipiwasog.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/mavij.pdfIn PDF document text
    • http://newmob.it/userfiles/files/35175090181.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/rutekasiwetuparedefiwulu.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/98612365794.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/84943244312.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/13954523106.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/zonozenonad.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f50160d50---tukutamosagerirefage.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614165f4b7a0c---1383761579.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/piviponagimejep.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/kb8nbh4qu590i3ljqfsi90ugmo/jimisiv.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/tikosoditilekiwa.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/dironeroxekuxulixotafa.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/48235476468.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/wugofuratigiwuxi.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/zefafudopukugutidinapode.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/73755514167.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/tevupidonika.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/gufugajopuru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=madea+neighbors+from+hell+play+full+movie+123moviesPDF 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_off0000c080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC080 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD892 17280 bytes
SHA-256: 2a8a04ccfdc000e1919330a51eeca3e8ca0bcca13c10f1dbe5833d2eac51137b
font_02_sfnt_off00010537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10537 11604 bytes
SHA-256: 1c994662d9ab24e7aaf97162f674172354236f090091f8c9103ed433fc265e25

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