Malicious PDF — malware analysis report

Static analysis result for SHA-256 e90aa8f687f0b1c1…

MALICIOUS

PDF

97.6 KB Created: 2021-08-16 12:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 33fcafaa92d84c20c61df9554acc574a SHA-1: 0ca3b152531fc44fb861bd34663a27a50605d4eb SHA-256: e90aa8f687f0b1c1d6d056b95a624ada5190db7088acb4eef922bd5fda9401e9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1190 Exploit Public-Facing Application

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many hosted on compromised WordPress sites, which likely serve as a link farm to distribute a malicious payload. The presence of a 'download button' heuristic further suggests a lure to trick users into downloading the payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7abe9ef51---20395601869.pdf In PDF document text
    • https://relans-nn.ru/images/docs/file/27492043366.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f08a19a57f---64281482201.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5998006b4---jajaragosotarivododozodop.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/bekovaken.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/68752893900.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/vadegarezomadipunegu.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca67fdee32---94921479672.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/99572662074.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/vijidu.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/14301262325.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/12569450200.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/40839501548.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/kisedowawigaxi.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b73a9cae73f---17737472810.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/b9ddce8698df6d841491a4bf6f52bc30/safagadowunujevani.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/55643670560.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/ridisikaxo.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c22bd56ef---38056256271.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/gogorubosupabitigigo.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/waxozemulojewezarej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=clash+of+clans+mod+apk+2019+septemberPDF 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_off0001179e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179E 11516 bytes
SHA-256: 3edecb1157683e22602f1edb30e60f4b179a23727341735bdd398cbc87f28a5d
font_01_sfnt_off00013291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13291 17372 bytes
SHA-256: 8271f44f1852c158f5dbb31ca066419de318ebda7580dfecf1c73cef6742272a
font_02_sfnt_off00016027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16027 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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