Malicious PDF — malware analysis report

Static analysis result for SHA-256 20276c2b7b48eafe…

MALICIOUS

PDF

74.7 KB Created: 2021-09-01 00:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 98fd99431f7b80e28bc67e4b68768a06 SHA-1: c7af183ae191f3181756e0e8b699e07d7b74e362 SHA-256: 20276c2b7b48eafe67d66c0bf49ef8bfbc9be674ba4d15ff4b9c277bf5d8c43e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.001 Process Injection

The PDF contains a link farm pointing to multiple compromised CMS upload locations, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads. The presence of external URIs and a link farm heuristic further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73da67e6b0---rumupewokipudovolu.pdf In PDF document text
    • https://cafemocion.com/userfiles/file/70098958595.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/wisezifojekabev.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/fugexabotufonebaxeme.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6ad851e89---wamugikurufabidu.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/qs0aliggjleol3d0ns4jgv0b07/66310832823.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b02bd89237---94674976595.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/kapinomutos.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/nk42if5lfakkt5el9tddj7tt13/76934346615.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/a9b2d4f5d9d3c239fc6d23bcd7196a93/tilefuwagoraruxujawazedo.pdfIn PDF document text
    • https://artgreen.vn/attachment/files/vezetinujepariga.pdfIn PDF document text
    • http://harveyfamily4016.com/clients/5/51/51a16c7d09a65bdad6d3cd8ef7da6b4e/File/77901927967.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/jisinukutux.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/wexowonudired.pdfIn PDF document text
    • https://iohrp.org/f_files/files/rukeditoxu.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073f4a92667a---76970275131.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/lqlbv3rif3u85bie13qlgpla6o/basegetilikolo.pdfIn PDF document text
    • http://hidropro.hu/upload/89998348846.pdfIn PDF document text
    • http://mousike.it/img_ins/files/wokososowamesun.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/45620856401.pdfIn PDF document text
    • https://izr.fr/files/bovasewip.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/63662311812.pdfIn PDF document text
    • http://lohsclassof70.com/clients/3/31/31ca850ff086a58b81c8700e10a01852/File/83261503080.pdfIn PDF document text
    • http://progetec.org/userfiles/files/26338876608.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=examples+of+some+idiomsPDF 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_off0000c290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC290 17016 bytes
SHA-256: 32761e7e858c9642d6524d0d771e81bc4fd50533a3873cd84078bd1d69cbac0c
font_01_sfnt_off0000ed64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED64 10444 bytes
SHA-256: 12980a82465afa468d503f97fa7635c5643d008ef8003205aad5dc7d88ae9ccd
font_02_sfnt_off00010513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10513 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1