Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c279fb1dc6fc794…

MALICIOUS

PDF

88.9 KB Created: 2021-07-07 13:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 17d5749c8c038a5b17a7e78f27632fd5 SHA-1: 8ebb661b94a1eea311b4d4241584942be15b5d58 SHA-256: 8c279fb1dc6fc794967a0d3ecca83237cf356a2cb6e4ec71ea8edb5df48a4721
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV. It contains a link farm pointing to compromised WordPress upload directories and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the final destination through a chain of redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://ranaghatpchsschool.org/userfiles/file/lenijubufudivobeni.pdf In PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160846a0e379c2---91842318508.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/980efe009f48becf7471cb4426adef6b/28613423164.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/2pc8k0j0a7fng6u01bpkv1eq84/22602958067.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/fisuwosag.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/5bd0142c7155fe85dfaf5555bb7dd390/26658787965.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021630154215488.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/94708637922.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606faede1d6e0---tilofoxojedowavasizefar.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16079bb8458682---bivod.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/rebuvapatola.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/bobegesokejovov.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/rosifaxogejite.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/2ekb22oij2f2qrh489jqsmvhth/48734470904.pdfIn PDF document text
    • https://anfauglir.com/images/file/fowopo.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc5b079d782---38457986714.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/e3cf3f5b528f790a580919fd45039b8a/70645896126.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/dibomajavanutijanizisab.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/larafojivenasefobofu.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7db29ff13---tikuruloruse.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d14cbef7e30d9a9e4ffe1e5874723b9a/1156241907.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/18599095416.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f8f12ae0d---50486296471.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/c6419da85a1f147a0c45e749d160550b/21649390868.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbb4a21391---84498638087.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=spear+of+destiny+manualPDF 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_off0000e716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE716 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2D 10948 bytes
SHA-256: 1cdc14b41511bfea14237a1785ab74ed702e2a31cd9c334251f92f1fcd09ce68
font_02_sfnt_off0001187f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187F 24148 bytes
SHA-256: 82fe3bf1e2ea1e005f311a1d403d4862852dbdddafb091aa1458fe507ba7aa71

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