Malicious PDF — malware analysis report

Static analysis result for SHA-256 834ccfe5dedfece5…

MALICIOUS

PDF

86.6 KB Created: 2021-07-19 07:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 18cb319f780f726f2f706d9267e1cde2 SHA-1: d2ae8f27b3a1df1b6c6e86b0dd53b96645edb84e SHA-256: 834ccfe5dedfece57f7c294f974b46a581515da209257309cd4863d4b2465559
156 Risk Score

Malware Insights

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

The sample was detected by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a Pdf.Phishing.Trojan. It contains numerous links to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and embedded links indicate an attempt to lead users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f93b057b6---69828576988.pdf In PDF document text
    • http://varadimasszazs.hu/uploads/files/butapivorujedomomara.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/difadogotixuvujosezajuz.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/lizuzam.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/rabuludoresaruninigu.pdfIn PDF document text
    • http://chicohigh1987.com/clients/47015/File/romuwasotuwojufowapewavul.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/5183612037.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/nigobuwasawejusis.pdfIn PDF document text
    • https://avvocatoboretti.com/file/81872958730.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/15129131322.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/77888129712.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/1295869438.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/3dc1542983155c30dc9e8ec07f659c49/xefowizipok.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ac685af92---panukerutememafitero.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/85751783644.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c564137e5---60994140326.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/fl8eukumaanb04ge4l62jdrajd/gepivopawijox.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160768b4d08578---58634223293.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/79fee7ec91191611754c0efd502880e0/37361293150.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/19183420551.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/panuxu.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/1d9e4ed8c4eb957e21e3c259b36d9cd0/foderusoluzelelo.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/b5dbf98aca2593390a16c8b2c9ecf4d5/29935076138.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/jabokimoxuxis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=the+greater+common+good+summaryPDF 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_off0000eeb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB6 17244 bytes
SHA-256: 0da395ee1826ced013583a75079dca298f1153ff629f7c8aec0a7170eb623d67
font_01_sfnt_off00011bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001340b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1340B 10856 bytes
SHA-256: 216a43a86ff0f65114dcf7c5d86a28343ebaf140b43b4223a015ea9cfe620646