Malicious PDF — malware analysis report

Static analysis result for SHA-256 22928b054fcb5e15…

MALICIOUS

PDF

83.6 KB Created: 2021-09-03 14:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 372c3482e5662915e2ed9ef39fad01da SHA-1: f40ae76aeabaf58f602ab29eb00ec69824d029f8 SHA-256: 22928b054fcb5e1546fbbfd55a9a760a11ed4b6a54818062c9e68d13d5078615
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised WordPress installations. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The presence of link farms on disposable hosting and the use of UTM parameters suggest an attempt to obscure the true destination and potentially engage in phishing or malware distribution. No scripts were extracted, but the document structure itself is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a22048d16e8---gibawabupiwosux.pdf In PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/1s48kkrp2hmhq1qju120sv6ujh/53706107760.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee4661de2f0---83470459954.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/nogidobarezawugufomatu.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/292fed2386dba85c4436b82859f577a7/49116520255.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/jexajoradadeku.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/35706878034.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210825042336447.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f3074356d---97019694722.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/90459317699.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161066c6a60672---xebosiraxub.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/11227216149.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/wiwexoputakekuwatetenum.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f07733d8af4---97648813370.pdfIn PDF document text
    • http://cmcthailand.com/ckfinder/userfiles/files/labejaxijowatow.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/70106926710.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/23557984207.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/moxazefidosasawukeg.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/g2ajhhi7s9h9sukd63800jo1e7/83853939904.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/rufaboxabapuno.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/acsarpbjil8ku4upnt8e5c0do1/rerotiku.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/porogozipuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=ghq+28+scoring+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94bf631878---xopiwub.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_off0000de1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF634 10972 bytes
SHA-256: 0b3c325fc5a0066b034b6b15e20f5f8a46bfc828993de27f8304d31b2b935bb3
font_02_sfnt_off00010f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1C 19136 bytes
SHA-256: 6e3a3a08fb27d324dd184e0857f9da36225c39eb2cb6c0d1ae4c69ebcae3340d