Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e134bc8ec76c3fa…

MALICIOUS

PDF

90.9 KB Created: 2021-09-07 00:25:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2a18f8483779298685c05003d7a0ee27 SHA-1: 685177a6f92fd6e1163561d0c596ef6ca956d2fd SHA-256: 9e134bc8ec76c3faebfb577ab764613d3ee742083b75ed352e2c3d51607a2880
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely intended to lure users into clicking malicious links. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://madiran-cruduparadis.fr/ckfinder/userfiles/files/49898496180.pdf In PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/e70e8addd553fa0726ea66b5681c2371/toxawisilitojazomat.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/5fac18dfc1b07580056ef95a3eeb043d/xokepasifo.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/tuzazebitubovazomiwupitas.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/n6uv9f6l54mhm93ltokbusdaic/79425920615.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/dc9tnpf0veuu5k5r8bt9n5682o/wupibiweberebifapirewupum.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f639e57a84---konoligupadegeja.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608133ebad637---zijubezibaveraroxalewa.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/34029751406.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160829ec9a1234---33096582234.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/wazodoxetuzaridojigo.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/pitorabewujininalupoluk.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/netulapobuvowenexit.pdfIn PDF document text
    • https://rubfila.in/files/file/wefefovifunomagurazabasi.pdfIn PDF document text
    • https://petikdaun.com/contents//files/nozerodavuvapateso.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/d2dd220e390ffd9c76a8b24de38157a1/14280337355.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612b27e1bd95c---90032659193.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/4e4ee33493ca6fedd39bdb95b43ee3fe/91046525465.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/16851367030.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/juvamo.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/11549324675.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d97b6f55b0e---51290294366.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/398842221fca4c586f6abd6b08b54b9b/bufituma.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1611f2f4fb06a6---meluxokesafu.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/retowuvepuriwideb.pdfIn PDF document text
    • http://charivne.info/images/file/jogafazijex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=mcdonald%27s+menu+printable+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_off0000ffad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAD 17184 bytes
SHA-256: 6ebc29f8f02627abbd35e4f42ef3900b208d1de660005caf35d88b8d7ec4bd74
font_01_sfnt_off00012c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C70 11048 bytes
SHA-256: 556dff184083badda579103b5520bf491e480348e44ce28068ce43c1d1042862
font_02_sfnt_off000145f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1