Malicious PDF — malware analysis report

Static analysis result for SHA-256 c94a957bc00950d0…

MALICIOUS

PDF

73.4 KB Created: 2021-08-06 19:29:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 09a980376fb7b877d13bc68c29f02181 SHA-1: b3b4228c9190f5522921323ee43fe301cd70568a SHA-256: c94a957bc00950d04dc35307dbda32c25d330345fb30222b497a117825624a2c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm on compromised CMS uploads. It contains numerous URLs pointing to potentially malicious content, suggesting an attempt to redirect users to phishing or malware hosting sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious intent to exploit user interaction via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6630

Heuristics 5

  • 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
  • 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 https://coretry.ru/uplcv?utm_term=unir+puntos+para+imprimir+pdf PDF link annotation
    • https://barcelonamedicalcenter.com/files/galeria/files/paguxewalivejopavul.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16108f4cee3320---riruvix.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/11658003db7c2a944a39ff8aed5bfb0e/jetidivafatanamoguma.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/9bbb09c9107b183261e4b5abbcf898f5/suwupagufer.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16079e4ad392d5---todil.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78190431508.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/94453914625.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160acb07ca48f4---98901366196.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/zowigavuxutafevukew.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/af00j72e3b86sne2ue45p0gvra/nobumegurabed.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/74533863377.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160895e808b107---24609561979.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075176ba3d1a---wotofagubebaxemakif.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ccd95422c---belotid.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e829e21a5---98783157298.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094d50040cef---jixeguf.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/43657745423.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/51493715277.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160d07f74c537d---60202135480.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/jokororup.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/lc86apb3ql5cgpchdfe8iff314/63061780056.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/35934217123.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/55842926506.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/90453d775f4f7303bb57b4d7d22017cd/lafikukufotuso.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/32848274383.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF103 18032 bytes
SHA-256: 24072bdd3baa3a920b3c8921b87769d17878739c5e07b06509bb5ae303a1c906