Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e43e17da2f3b0c1…

MALICIOUS

PDF

85.7 KB Created: 2021-09-03 04:21:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 583cbbfcb2fdd9999d49036c4df7172c SHA-1: 359a2c714749f944459331639244c0a5f6965a66 SHA-256: 3e43e17da2f3b0c195048a3cc8846d17acf1f1ac07bea9df347a1dff933e4a49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal a link farm strategy, with multiple URLs pointing to compromised WordPress upload directories and disposable hosting. These links likely serve as lures to phishing sites or malware downloaders, aligning with the T1566.001 (Spearphishing Attachment) technique. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdcb8cbbf7---29016991896.pdf In PDF document text
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/6087383075.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/a45c993565c317e6ea57a35196ca886e/25137017126.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/zetar.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612c1d6157263---roliliti.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/sikobosejidugojapowifoseg.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52683532144.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/77r1sshllndd36rl4g5efpb7pe/duvoxesuwo.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/99734675587.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/07/202107300902246327.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/87700500630.pdfIn PDF document text
    • http://revtechnik.cz/userfiles/file/72545486029.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16108e883862ef---93881970689.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/60430434889.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/21090543690.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/3f6a4849673e0a45ddbf68575cbf40bc/kadewebopofidekagukes.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/fulegupoku.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082ff28c3c84---54574368434.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/m4kgok3sn80ms5tumfr95a56r0/nidedakevopumibaral.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/rafopurasolebeputa.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/laliro.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/96074277222.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/wulusutakob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=book+of+judgement+pdf+necromundaPDF 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_off0000e7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A6 18976 bytes
SHA-256: 97ea95fe1a531ba00cb85d7b94e254010f8bbe13f5075383c9d5b0074494093e
font_01_sfnt_off00011807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11807 11032 bytes
SHA-256: 8a72df0da0d7c9355fc45f15267e5b6165fc6a16266de04cb6d700f804325308
font_02_sfnt_off00013187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13187 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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