Malicious PDF — malware analysis report

Static analysis result for SHA-256 acfba07b0fb9173e…

MALICIOUS

PDF

92.1 KB Created: 2021-06-25 22:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 636574314f5816ac78372bb91f27c12f SHA-1: 5b8b83df2565d7f6caaa8aeb0980ad3b08b885ad SHA-256: acfba07b0fb9173e02f4e3c1275e9c089c0ae6a87d5cbba770ffbcae75b1cd97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4496616c8---16237297857.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c60c4adec9---sizomife.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/5d370a90e7dbcf4d7e36c2dd9e863b83/48208429785.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6de32f58d---57188515439.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/4c7056bdbc7ffb9aac2763c256b5ee39/59232748555.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/fe718defdb242bda7a487434e44cf303/fewotefaxomofemotena.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/094566719f8a0dcbc9aaab0206f6651e/90058281009.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d93f5ed2b6---44890356267.pdf
    • http://eprdel.cz/userfiles/file/buxuworaxabanetuzekefalo.pdf
    • http://ciarajewellery.com/editor_upload/file/lawotafug.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160829e0f71ca2---43603699526.pdf
    • https://astek-telem.fr/userfiles/file/66433755888.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/41861602106.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/2e59016f96547975f08ccd5ec8a8824f/69104329782.pdf
    • http://coopmong.com/ckupload/files/xexixebow.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/j5kteke9uard4vao998faotsqu/41001342348.pdf
    • http://hainescentreasia.com/images/file/mumikugenifedabisezu.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/o7r4dpsrnddbdpi24v77vnvd0j/mebewolurododudu.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076eb156d1a9---38016418035.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/mru4fkc3ddq2k9l15pn2r00am5/mefuwagufufovubuw.pdf
    • http://broadmoor80.com/clients/866172/File/8263880736.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2663704d15---75565388418.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160998aee94583---73597562938.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=if+you+ask+me+if+i+love+you+this+much+i+do
    • 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_off000105e1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x105E1 16792 bytes
font_01_sfnt_off00011df3.bin
7f29fe8b14e94d21aef6e0e1ae8ee406098ef268bc1f7ee08a889634cc5bbd48
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF3 16884 bytes
font_02_sfnt_off00014a02.bin
49fa303221d0d471aacf5ec7f051d0684d16b7922fa69fad49325e1689b436ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A02 10860 bytes