Malicious PDF — malware analysis report

Static analysis result for SHA-256 66bfdcff032ed6bb…

MALICIOUS

PDF

83.7 KB Created: 2021-09-09 17:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1bb99dcba5bab82f0d7d8bfcc09ab186 SHA-1: 21d6e12d49a7d95578473e63a1225dc55c85165f SHA-256: 66bfdcff032ed6bb65cdb203b24d15222e2b10dced09fcd32b0a67b1df784630
164 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. The document contains numerous links to compromised websites and a deceptive download button lure, indicating an attempt to trick the user into downloading further malicious content. The presence of multiple external URIs and compromised CMS upload links strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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 https://oniceh.ru/uplcv?utm_term=this+type+of+file+can+harm+your+device+apk PDF link annotation
    • https://lazdynumokykla.lt/userfiles/file/95264263360.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed24874d41---83414268844.pdfIn PDF document text
    • http://promise-land.com/upload/file/60322177372.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/24717866571.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/fanonasigopator.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/16914432389.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f54749b19f---bepejapuj.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///zoxikijesuligonivavebop.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/79679507905.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343e1043d28---95901777313.pdfIn PDF document text
    • https://biodez.lt/i/File/zirajefesotovomib.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/senedinewinozis.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/fareso.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/wifolebaxedivido.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/wiwakiv.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/jodabajosi.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/75674354324.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/61488655604.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/22144478155.pdfIn PDF document text
    • http://zhymwz.com/upfile/file/kerola.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/jisobafi.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/sewijajemazapabapo.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/09/39879273514.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/zavezigavav.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/40745066862.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_off0000dd0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51D 19208 bytes
SHA-256: ed42b518de0e8e7604e15a764da94c5c03652235e7e1a52e77745712f1fcd092
font_02_sfnt_off000126d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D4 11220 bytes
SHA-256: 29d5bea95b099714a32c7886708b0f16e6b71c53ddd27b41a1c59f889ed8af82