Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d124c20c7262faf…

MALICIOUS

PDF

88.5 KB Created: 2021-09-17 20:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8aebbdcebc5b39cc790dae32d8cfecb7 SHA-1: fb3ef0fe00faaabf8c622db4f62ecab73b0746ad SHA-256: 3d124c20c7262fafc6208139291e98ff5555b3a8a5fbc22ca817cc52134de65f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple disposable hosting domains, suggesting an attempt to distribute malware or phish for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the download and execution of a second-stage payload from one of the provided URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://americandeliorder.com/uploads/files/3316939310.pdf In PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/161315958c338c---4478464643.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/55185705773.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c94d87f1dc---28274681802.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/92429244644.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/27514530586.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/pusirenupagotomagi.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109090049325568.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/46369338132.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/21971575999.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/mosuzemutovupiwegafikuzog.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/53324939070.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/17283282023.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210908174424_jggysi.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/morodekunesilelo.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/leledevo.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/zugepigegokepulepo.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/doxivegelab.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd41417cb3---bizedalef.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/89491748789.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/16549422646.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=game+downloading+karne+wala+filePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF2 17980 bytes
SHA-256: 825a5f43796bb299eebb7bfe583695d4d6fe21fd39b313ad60b4b422afd0843d
font_01_sfnt_off00010cf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001250c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1250C 10648 bytes
SHA-256: 4b08bf7f15288278063375048bcfd8ce5da6062e2edf457cbb7d2f06f0f67225
font_03_sfnt_off00013d2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D2E 16416 bytes
SHA-256: 0a7c40006fc27d51153b21d6a48ea79a8c7f146cc8b15030b343ea684e52a4c8

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