Malicious PDF — malware analysis report

Static analysis result for SHA-256 be7b33619033ea6a…

MALICIOUS

PDF

77.0 KB Created: 2021-09-09 08:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 59900cb8677bb69a1bad72cddb6a3d27 SHA-1: 45c9d221c69642ac93ad4109ac5be44eb9d31296 SHA-256: be7b33619033ea6a4289ed8ab9e7e6d0ee0955d90cdbd3b8cc2d726b0387c406
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://dbmotorbrokers.com/userfiles/file/82020205712.pdf In PDF document text
    • http://bastola.org/userfiles/file/41254113115.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/98968148454.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/94564135459.pdfIn PDF document text
    • http://ipublicity.cz/data/file/55017130197.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/sexafosiju.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109032159038073.pdfIn PDF document text
    • http://salt17.com/userfiles/files/mudufid.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393057871e5---29020670062.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/bojafomodokopirosenabegof.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/94475062298.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16137d0cd3ec36---xokajusopo.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/vogogefijikeza.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/74077849796.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/nefolupaserodag.pdfIn PDF document text
    • http://njboyuanchem.com/upload/files/75597997310.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/moxefodaserit.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132e5dd67979---34264879436.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/88830925322.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/3663660050.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210909105124.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/zarajo.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/85212468156.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/vobepasazefinofeles.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=tango+live+video+appsPDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/gelisa.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_off0000c99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AC 17748 bytes
SHA-256: cd7ee1d70b3d29211ac53235b6db8b761a909ca6059a2f44263f974c8cb18dc2
font_02_sfnt_off00010fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB1 10400 bytes
SHA-256: c13f668897e2013778bced6f8e98b8c5ad4f271c45ee27f90aa014e4c790e14f

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