Malicious PDF — malware analysis report

Static analysis result for SHA-256 2df17bc7ca914c52…

MALICIOUS

PDF

92.3 KB Created: 2021-08-06 07:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ffcd9993808d5d8d8f0633c5bd631515 SHA-1: 5be3fc65c330bb4972adf5efda417d0f1318563c SHA-256: 2df17bc7ca914c5290c8fbad4849c7d75e71d1b8be801733fb6c5fb62cdad6f5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple URLs pointing to compromised WordPress sites, indicating an attempt to host and distribute further malicious content. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggests these links are part of a malicious infrastructure. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d2c545d61---508799682.pdf In PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f50c0932c48---82928865819.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ac682f3f0f0---69047236842.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/jesutimomugoz.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/womirod.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d18c2c1a37---zotupofeke.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/lokufhu1d6ab2cp72a98p1m46g/bifelefupelejusudasi.pdfIn PDF document text
    • https://hurtowniaroza.pl/upload/files/82256579349.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/fde3e904ba9f2662ba66bb51f6cd598a/zabulaxexod.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/1021279853.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/8269868173.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/99815393781.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/4hdnvbdi90n8lqcrgti89kpmf9/36330847943.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/10367197082.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/e451b064b91fa21a94df0ab7bb96a070/34242083298.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/11583599672.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae41a8280c---97301942356.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/10691517787.pdfIn PDF document text
    • http://sxcec.org/userfiles/file/wadomatu.pdfIn PDF document text
    • http://ud2-140.com/files/solodulevejesevuzu.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/a23d5d8ef1ee85ab08106e8eec586086/bodufuduputelu.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/finirepixe.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/78837139955.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/xeduduso.pdfIn PDF document text
    • http://donaldbermanmaimonidesgolf2021.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/13804083447.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/tuguwefi.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/48208670650.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=strength+in+stillness+the+power+of+transcendental+meditationPDF 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_off0000ff07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001171e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171E 11228 bytes
SHA-256: 492c4f935d9edb808276963e771e3233bd151a5e6d86ebd3f79f35ef6997de12
font_02_sfnt_off0001310c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1310C 18264 bytes
SHA-256: f756a9ac025286b769dfcef415c0a00c5b9da6bf8ef2ab3d51c5d6335e5d599b

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