Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b0e0c613cc66d3b…

MALICIOUS

PDF

71.9 KB Created: 2021-09-15 15:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0dc9ec371c7a8ef059e196048d5e1cb9 SHA-1: 1c83bf7c39303767ff4ae80f3e7887f2bc3a952d SHA-256: 8b0e0c613cc66d3b391763a6c9271b4e7e14fe0958cc3e8f2088c5ac94d5fbc2
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farm characteristics strongly indicates an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://panificioilcavaliere.it/userfiles/files/52716559701.pdf In PDF document text
    • http://fobas.cz/userfiles/file/20669209670.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/tetuzibaw.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/10718758309.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614179d23a0c5---lefusuzukogo.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613a18b07926e---29278555821.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/fisiwabunasewak.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202109040107055390.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/56678332613.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc74e74fda---51648562516.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/88164501030.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/97127011560.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210914042051_43vh3p.pdfIn PDF document text
    • http://jedwines.com/cmsCart/upload/file/68397215509.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/3910594201.pdfIn PDF document text
    • http://centrons.com/uploaded/file/2000319359612fcf754cf32.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/fizoguzusumabuligipi.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/66400143429.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/46489769514.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/3d1a957712cc3611f3d8e99326e93765/wofeka.pdfIn PDF document text
    • https://lrdreamteam.com/files/files/file/InfoProduct/file/ligerafimuto.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/6kd89n81udr7i8idsstr1umjt6/roxutiwomosusemoxuf.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/tinewosilosiwikonirowoduz.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/nifitasuwijobubeveranixon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+create+apk+in+flutterPDF 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_off0000b684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB684 10572 bytes
SHA-256: 2bd24d6f88c6d88963ebdae144392a9514bfcd5287556231a6a5900f526796f8
font_01_sfnt_off0000cec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D7 16884 bytes
SHA-256: 22f735c4d62fb04a6816f65e9a63c840cd25cf543b8233b4e432e7c8afb2cdda