Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b70543540ee277…

MALICIOUS

PDF

70.1 KB Created: 2021-09-05 12:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5867b82e812d706699df685778cf95e5 SHA-1: bdd8410a2dadd8a9975f38a670e77f82a7e851c4 SHA-256: a5b70543540ee277acde9502259d6ad4ecb15996e50317ccfa39de2022469c43
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to distribute malware or conduct phishing. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, pointing to an attack pattern focused on redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://clair-environnement.eu/catalogue_dynamique/file/72792842703.pdf In PDF document text
    • https://fizjolech.pl/userfiles/file/90000248197.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160873a23197b7---5954426195.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/dipukerinorurelavabo.pdfIn PDF document text
    • http://mextro.de/upload/files/tizepezefolazadimeg.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/pujopuzesesepepatulofobat.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/ralomewogifosunezokafuxu.pdfIn PDF document text
    • https://cmetrix.net/ckfinder/userfiles/files/kigezifoxedatokez.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/11cd39db2f5d9aeade2f31e3bab9c484/45316045836.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/s2jgdqt6qfsbf4fjcjqbmseee3/39573731268.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612a379739a6f---7101279278.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/pitosa.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/runeboxogumixagapazu.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/858524999683c6b6e37a2233aa24265a/bokudilupaju.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d74ffd34f96---74143871958.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/70od1oavc5ohqo5v7l8m25vq67/gineki.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/6c10ee34a7bbcdf725ef858a253b0705/6179385197.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/70121125917.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/84746929637.pdfIn PDF document text
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/94250140637.pdfIn PDF document text
    • https://farmstead.tw/farmstead/upload/files/26340664583.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=production+technology+lecture+notes+pdfPDF 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_off0000b4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E2 10952 bytes
SHA-256: 35b1986e884001545c5f485db81eacd61f46435d17c55ee4fa2cf318d4570cc3
font_01_sfnt_off0000ce03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE03 14724 bytes
SHA-256: 436fb464832b2d156f5c37fac2b227de58383943428299b8fb3633b4200491f7
font_02_sfnt_off0000f282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF282 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.