Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d40b04eb63e3108…

MALICIOUS

PDF

84.2 KB Created: 2021-07-01 16:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec519ef3d5b9f72912c33051c6bec13d SHA-1: 9f33976f5f81317de77092c846d9b2aa44cf852c SHA-256: 1d40b04eb63e3108192ba522fb151f72625bc7d0b0d856c8429b587038de126c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to host malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern. ClamAV detection and ML classification confirm the malicious nature of the file, likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • 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 http://dishandspoonproductions.com/ckfinder/userfiles/files/67037034051.pdf
    • http://emotionpicturesfestival.gr/userfiles/file/bopugawufiwis.pdf
    • http://landia-print.com/pdir/file/77044992562.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b81a5ea165a---bijifazawewux.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/a0286b752fda22886619d9b7635ada7d/tarubawuxeked.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8bad619cb---sawogozofuwaboxezuzojob.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/di2ivoq0rsjised5561o355i8b/73974225078.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cfce776a8---mabitobupofetulogamimul.pdf
    • http://cesmclassof68cheyennewy.com/clients/82478/File/rigafamupaxanuw.pdf
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/07aa2785f3e4a62a747ab2b81d434638/23767544599.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609cccabd0593---28340476860.pdf
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/gvmnopav4qugfnb9pn7reg1kil/fidupagamuxote.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c78d3c25848d24516c6335c972b938ce/10192508146.pdf
    • http://www.aadhar-interior.com/userfiles/file/tizagidajakivuve.pdf
    • https://landbar.com/upload/files/95567668257.pdf
    • http://www.cerathai.com/image/upload/File/wirigogiserig.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc2598980e---7516496808.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f48912e661---roxuwirebunimi.pdf
    • https://atl-50.com/files/file/zisete.pdf
    • http://godswaynehemiahmbc.com/clients/878002/File/68138882180.pdf
    • https://alixdemassy.fr/userfiles/file/javevane.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b8ba78dac---67728983854.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160afafea3228b---nuzomab.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6c7ce5dbc---542518536.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=subject+verb+agreement+example+sentences
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5b7.bin
c6f53c736fbaedd4e8e312746e6432046fb42eb4afa52d607d9c4836b5a234a9
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B7 16704 bytes
font_01_sfnt_off00011124.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11124 16792 bytes
font_02_sfnt_off0001293b.bin
ce9f06b821597f33a813b5a5f2957c95f1663741d1f3896e8b55b1a23fff0c12
pdf-font-stream PDF embedded font (sfnt) at offset 0x1293B 11116 bytes