Malicious PDF — malware analysis report

Static analysis result for SHA-256 c11652dfb4ff1c06…

MALICIOUS

PDF

82.2 KB Created: 2021-09-07 13:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 340e0fb22fd0eb9a63e3df4269343be4 SHA-1: 6d9dd8e9705176d79b4472ce711ad6e4e1bd7b42 SHA-256: c11652dfb4ff1c06ccd1721c4616cf844731a4604adf7ddb4618c9a373eb2115
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve as a lure to direct users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093c9e9db531---botimawubajaja.pdf In PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/22378381876.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/vowusafibodimususelal.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd54becce1---76121248892.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/83277274721.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/54012615089.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/kavavotoxuxalaluzimom.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/col9s86gn6euf1j436o7o00gec/dewelusogareralanib.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/zefafunobukemafak.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813e7780671---suzebag.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/51672403667.pdfIn PDF document text
    • http://iswii.net/ckfinder/userfiles/files/16669940915.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/2ldos9i0d0r0ejhlpb6p3tald7/delusufufudederig.pdfIn PDF document text
    • https://filetorme.com/upload/files/66731799696.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/58941738741.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767ac4d7f2d---59912734814.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/gonofiduti.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/mibukimexavokizowuguma.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/76986887471.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/76616995280.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/v80tg7enpjjldqtupl3v2733a2/54043436058.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6dfa68c16a---49488511609.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210805104319.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=plato+the+republic+book+7+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_off0000de00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE00 16920 bytes
SHA-256: b857aaab26de7b6c1005fd0f02bede919b3d8a54fe8348d814edb204c7de21bc
font_01_sfnt_off000109ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109ED 10828 bytes
SHA-256: 7d6307242f4c5dedd04e36adab5af8122a93b761a240d5f0b31205f0691dc1af
font_02_sfnt_off000122e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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