Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca426afaf871e3e…

MALICIOUS

PDF

96.8 KB Created: 2021-09-04 15:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5509841cc1d3a3f8e7fd297d96aa7ec3 SHA-1: 556b9a59dd41957f5aaa5b14c3b69f4d95fc9735 SHA-256: aca426afaf871e3e62df1a26dab23cea3c4e21ed408189ef8c90cb420ef880a0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, a common tactic for distributing malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external malicious sites, likely as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/5e803fa20bb904986b4c6290b9f0f242/terumaviwu.pdf In PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/c592df8bd53b72806cee7d79ea963237/10003293452.pdfIn PDF document text
    • https://cebrigantina.com/025-CEB/images-editor/file/kabufuzujisiwe.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/37657695776.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/72745227351.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/2239853335.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/mirixinofiwanevezopizarez.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/90912538285.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/27080209399.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/59cfda189e4f79170b142ef36facfa8d/tibudafikamupas.pdfIn PDF document text
    • https://europartner2.pl/uploads/44223393749.pdfIn PDF document text
    • http://tulsamemorialclass1969.com/clients/8/8b/8b8b36ecbaf17f244e47af75a29dfbe2/File/jufuxakudaligefojeg.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073066e48b40---kadegusimomisapu.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/47268647858.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/cvlm8rlu00kep90pibvjjsfnhj/71230098517.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/58df0a6c2e796deb72d835901332cfc4/53083263099.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160abcffa81177---66021787180.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/9aa0db90ab014be50dd71e3e5794a3ca/48287743570.pdfIn PDF document text
    • http://geyuping.com/geyuping/uploadfile/file/2021081323472173499.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e3e98b35d14---ditosorugubut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=proposal+on+drug+abuse+pdfPDF 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_off00010fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBD 20616 bytes
SHA-256: d20732ba621ab69fcb70629a609c6e23038ed311974edca67673d3d444dd50ef
font_01_sfnt_off00014605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14605 10724 bytes
SHA-256: 259663bbe87422e6b711f8b1838e9042ace23f85865c3012c53ffe91c88f0606
font_02_sfnt_off00015e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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