Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfd16ce95cf061de…

MALICIOUS

PDF

83.8 KB Created: 2021-07-04 06:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: add090d32eeb5bb066aef57242a4b0e5 SHA-1: 17580351bba9bd8e73b4496372521106143671fd SHA-256: cfd16ce95cf061de5f1a27e3b7977df0d9dcc28c8e6a659fc32d938ccc038d8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, such as http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860c5380b4e---81077412816.pdf, are key indicators of this redirection behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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 https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/92124cc3d15b46a67ba39d642d747977/56845355673.pdf In PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/6306495864.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860c5380b4e---81077412816.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608f56a7ece04---97076632186.pdfIn PDF document text
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/julovokadoxukalojode.pdfIn PDF document text
    • http://autavrabek.cz/obrazky/file/nebulovowutofo.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160805dc1c9834---11537092137.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/49060757649.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/bca3d9c83599ff4833f750383e9afffe/24509302309.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/pshl6tvg83ui7hseqa2ho5hv1b/rakosalabanoda.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c17a25a0ccb---vosipakuligumuxeferevav.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/8122018223.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/5fae69cee109e27fb6ace5bd740c9963/sibazekitovetuzunita.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/81236347928.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/nopometorumibunag.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/81670344398.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607422d3acd2c---7162640271.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bb46f8061dc---robugixarala.pdfIn PDF document text
    • http://brlairport.com/images/file/madulef.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/pubexelanivab.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/828135030f29239c98407602d3b06c7d/66438028725.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0e4ad4bf7---73850481272.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=olmsted+county+property+recordsPDF 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_off0000e364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE364 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB76 17460 bytes
SHA-256: 4ab2ffe183c2ae9860b7b71695324e3437eff3d2989dd6e9b4f6ec74e171fd8f
font_02_sfnt_off000129ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CE 10660 bytes
SHA-256: a91f4d72c531ba65dff549bfc36185be18fc991b36f3bcdc27ced1567de6e93b

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