Malicious PDF — malware analysis report

Static analysis result for SHA-256 37cc2f70edab034e…

MALICIOUS

PDF

89.8 KB Created: 2021-09-16 15:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0985d80457693e7bcfba41b68c90c4df SHA-1: 1d29835285dd25c1d007720b2457fa962120e345 SHA-256: 37cc2f70edab034e7b8b85fecb91c9fd0eb36a2a4fb7d24c14cafa59cde6b41d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress sites, suggesting an attempt to distribute further malicious content or conduct phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140073e6b340---91931417924.pdf In PDF document text
    • http://gelikonline.ru/content/Files/7045184744.pdfIn PDF document text
    • http://czminghe.com/upload/files/bikalomasenanemafasubub.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/kilutajomexikufufefude.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/tuwagivinulikopifotageni.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/pebuvukesudusetus.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/fawojapepelubuxiz.pdfIn PDF document text
    • https://cncunse.com/d/files/xawujoluvokudevow.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/8516551759.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/xewipaveb.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/30329756488.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/9424819082.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/wajirowotevefixesobali.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/dojavidume.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/vunutekekevape.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202109141050484176.pdfIn PDF document text
    • https://telliogluhukuk.com/userfiles/file/69882510532.pdfIn PDF document text
    • http://abhimaninteriors.com/ckfinder/userfiles/files/40680553305.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/kosekobisodewudaxaxeluma.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091417450239.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/d867c853g2rhr9crefn29s5vid/memoxoriledogos.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/4840892880.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/vubugorokavadodukeweliz.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcf4ca7fde---78148298647.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/59799546775.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/bexebametawodubit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=gehirnjogging+app+android+kostenlosPDF 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_off0000f492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF492 19660 bytes
SHA-256: 1a50994f99163fba1ad8280b392360938034af0872c762382edf8ccc64a1d775
font_01_sfnt_off00012696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12696 10932 bytes
SHA-256: 469a5a8558dd9176b97aaacd4dd6e38fa175a0e62255d99c344ab8e5bd7c1338
font_02_sfnt_off00013fa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1