Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed4d65a2469d7d46…

MALICIOUS

PDF

88.2 KB Created: 2021-07-16 09:20:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 99fddcf37254200df5e2bd998e3c41a5 SHA-1: e4b745c012b26a94a46aa9a139ffa49c349ddf4d SHA-256: ed4d65a2469d7d46fd414e37d1aa1369029437c4a7f385923ecb8b9d93c950e2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites hosting PDF files. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these compromised sites to host malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a lure to redirect users to phishing or malware sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/cbb113e30e8f69ae809897c43c0a9708/labowelugopatereregewoja.pdf In PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/8a8189130597da41def0f34b24fdc832/12069849116.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/e23c1b5b0d3b2bf46364f3020ea33c10/guwugavemujiwuzi.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/931ad16d80618304ceec5050b25b8c17/sugilux.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e53fe3ac02---31024307129.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2e6ff3745---palipipozalefubojajes.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbef796cd1---66729457566.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160a15593c4842---xesalobemijelifez.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2ab2582b8---53966021764.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/knd183g5ihegrqf8bc2bk3p9i3/pubitubokejinib.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/a87cc95c97f7ca53c52a4e42f29cfc69/kikatiwoniwozukolek.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bfad278b8dd---22953211221.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/79810610542.pdfIn PDF document text
    • http://dkyangmei.com/uploadfile/file/2021061704342973499.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098af82224bc---22399040392.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f081d2e49---lunix.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/41895310293.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/95973394838.pdfIn PDF document text
    • http://c-amc.com/upload/files/dimagatewidakanasajum.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/r1plofgodheicgpr58pnunrio7/temivi.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/43381098200.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/bopowidivu.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/202151429289082.pdfIn PDF document text
    • http://ore-processing.ru/d/files/20959522197.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=tanglewood+case+study+7+answersPDF 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_off0000f584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF584 17352 bytes
SHA-256: d8d357b95dbf40b2c54d552424136b39567873d1063a32983f0eba2761da2d0f
font_01_sfnt_off0001227e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A95 10768 bytes
SHA-256: 1fe7802c4e32458fea57408f35d232374acbaddfc6d9b183214714ac4190d608

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