Malicious PDF — malware analysis report

Static analysis result for SHA-256 db04941ec2139377…

MALICIOUS

PDF

75.4 KB Created: 2021-09-08 03:30:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f7903409469c859e40ade1c412e394a4 SHA-1: d9797c3203c1a718c55a212a85054aa5ce407123 SHA-256: db04941ec21393772adfb2bc9dd9d7aefd007e7a97be4774e94a5a5edd9773b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://s2ipower.com/survey/userfiles/files/74779731665.pdf In PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/garutafumemobodaderaweb.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1b318a380---75186165965.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/02fc71cd9a740017d0bbea91f33769d3/buwap.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/bonezubufaxu.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/628vbs8vcg5c220chfeso8q1t1/24279228202.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/e30c87a0c5dc3dd481f21ea5809a8963/75984529013.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/vamaninabusebotogeguf.pdfIn PDF document text
    • http://elitvorota.ru/f/file/sukapebafojaleba.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/xoxupabifezi.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/keq2oe7ijld9h7b6oc3dmb3qtl/gefaduziwuvidita.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/44633450141.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/3a982bf209414ecedf7b7a4ce50353b3/44774647671.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16071c68db60eb---fumenava.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/28014816097.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160be7204076fe---46695747369.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/10460438016.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/c00158e65100becbc31f5c4b8f6d6acd/45215897376.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/4fo82j6fu020etuesrdndorio3/20012251100.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16130ac07c7bb6---67986224701.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/ulno4c020skn96sf77sf7l4bqr/xinipax.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/c3681d37b0cf9f66ae84edc3f26d6a18/zimomarizifibubewup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=tally+charts+and+frequency+tables+worksheetsPDF 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_off0000c21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC21B 16956 bytes
SHA-256: e88b16eb398f364776899e55d27a107db9cebbc9ceb755de6be600f7a45999f2
font_01_sfnt_off0000edbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D3 11120 bytes
SHA-256: d2214f3198a07e31bed7d9f00a3a8f7a9609d7734bb0dd6e213c3372171da5e7

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