Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e8e8d5a25cfd809…

MALICIOUS

PDF

93.2 KB Created: 2021-08-09 12:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e62a7639862bb74c7bdca8c1a7f583ae SHA-1: 6afbdb6081b1b40d80d89f2292ff44c9d9c60784 SHA-256: 7e8e8d5a25cfd809297b32bb88710f8d9b5fe92fceb43a59319dc02eee7624c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest a phishing or trojan payload delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://inwebjor.ru/uplcv?utm_term=memory+techniques+book+pdf PDF link annotation
    • http://zonweringbelgie.be/ckfinder/userfiles/files/2510882553.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/b4osaagg3rs43ghktohep68t7i/sapijif.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608088ff7384b---diwifogodar.pdfIn PDF document text
    • http://anthonyellisonfamilyreunion.com/clients/f/ff/ff850d76676c1858bf5e443b7a907d3b/File/92271795765.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac36def1184---taragugonobuzitaxeboveruw.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/sijokunepovebinajevogig.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608405c0abb44---dabagef.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/duwebirurazofibagop.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210725_052647.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/7a1aefee5a856ff27fcc0ecec7a9d39d/kotiz.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713c07f16d2---11877017347.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/bekagorolu.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/1941937ea4d18b0e27afd21b48ce9724/vejebopuvobigulifenonu.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/121a6e1c92d0f32b3cfac3403919fc9e/56413890406.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/83533336560.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/84942954950.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/45883583921.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871934bbe39---46467681445.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/af7427578a515c86014c51e9c9449ce1/lavoviwukilisubisug.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608eecad82314---luzesasumezekoxuwidubiwe.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/32f96c9d5b0ef0f9d80bfbe798abcc33/xiwajuwilanumenifabag.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f683b7cf7f---2087986482.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/650f605e85f47172a833ab3dd06deb05/88546207570.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_off000107db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DB 11260 bytes
SHA-256: 992374564ee14f5ab1fdaa52b1c4a8a7135268d51806b516b748de279b831b74
font_01_sfnt_off000121af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C1 17188 bytes
SHA-256: ff3d39056caaa822173a655304e09b8810a516860d78097f3253b65c663460fc

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