Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb516a57aa47c5a…

MALICIOUS

PDF

69.0 KB Created: 2021-09-26 15:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: de98b3d8c2cbd3e9e5540a94b17ea937 SHA-1: 89b31f883adb2533374ed32b27dc50516262990c SHA-256: cdb516a57aa47c5a6ca85191c6ece4b3e13e3d0ff5b8dad047b9b55f10967dd3
184 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains an embedded JavaScript stream and numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting an attempt to redirect users to malicious sites. The document's structure and content indicate it's designed to deceive users into clicking these links, likely for credential harvesting or malware distribution.

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://synerhu.ru/uplcv?utm_term=funimation+mod+apk+premium+unlocked PDF link annotation
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/87807740333.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/54438042023.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/pebun.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/14463100184.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/78523295100.pdfIn PDF document text
    • https://soudurelausiere.com/upload/editor/file/7852398824.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614fb8352e9a1---ladipixopabep.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/81074311163.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/lavisizalave.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/pudidojenuf.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/wajugowivatijowarubuku.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/leniz.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613dec6b8b4e1---56106854418.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1dc8b6cae---78850093131.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/34313448601.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16149ee4bd76f0---46136057662.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/98600815707.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/lufizuzufi.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/ritibaliromixamegiwa.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/57276942734.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/37975797351.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/9116122734.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/likotuxinoleripakujiwun.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/tugejanumeketakagukisetu.pdfIn PDF document text
    • 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_off0000b2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D0 13932 bytes
SHA-256: 2b83607198c965d67fc89e3ae2a7103861a834b9c072350e2d5ecaa0e8406a34
font_01_sfnt_off0000d548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD548 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5F 10676 bytes
SHA-256: 6d722628a49b65553b14096526eab0f81967fcaf477d9d72db59d19439fc275d

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