Malicious PDF — malware analysis report

Static analysis result for SHA-256 f76d1d3e281fa78d…

MALICIOUS

PDF

98.4 KB Created: 2021-08-01 04:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 89f54e39769cd0d9b5c03041bffbe016 SHA-1: 953a30587cc31b78e573e72083a12f56fc90264a SHA-256: f76d1d3e281fa78d3c758d6073fc456365b28f5b2260ddbeefdc711157eda69d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These links likely serve to distribute phishing content or further malware. No scripts were extracted from this sample, but the overall structure suggests a malicious intent to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9785

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 https://ketchas.ru/uplcv?utm_term=dream+town+story+best+layout PDF link annotation
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/eit6dj41vng1o9cqmtr7h4ncjk/dopufaju.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202106281050466349.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/ab54310465335c938311f5a0710a1dba/42046577085.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cfea3c996---2280864103.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/dowosan.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/kesuwakutolibupolakajeje.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/443b00aa7393470ef0e7d7ed00087f4b/wavakajoxuzaz.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/17213de4c2bbd035b1f99d1029c12eb7/lizorizulovimenupum.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/dadd5e95b43f243b17fccd9837eebf4a/80523807272.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/2870ede6e3ef65ec1f8dfea3f17aaaa1/30629773336.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1626603949.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/9cc8b6c1ec0a53c23ba27ff73899f360/91590281912.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/felodarut.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/fbrd2gps8dfnjevqrmq2983q92/memiwufaru.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/63c77639c6adb188838a3bbf45caea13/semaxoja.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/tifemora.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47b7ce19aa---43279840052.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/pufibug.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/rkkt4pk6jqenpl4la5h1f6fgnm/tanabukagegukibepu.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/20675363978.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/sukefelupajefisobekumaz.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/zusumez.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/57472050588.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16078487cb5b84---59557116416.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/39015752330.pdfIn PDF document text
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94A 17604 bytes
SHA-256: daf66b46ba6030bcd975df36cc8adc00b0bd61aba373d29313cd8f59fc8223bc
font_01_sfnt_off000127cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CD 2760 bytes
SHA-256: edc6fec6548612160bd8f54d150f686a1852a874b7f61a23f66f1bf01331707a
font_02_sfnt_off000133b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B7 16520 bytes
SHA-256: f6e8e1a4b994e2c784a8a500700ff719bcf12c931878c096ce905f11be03589c
font_03_sfnt_off00014a8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off000162a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162A6 10620 bytes
SHA-256: b7c54e662feac11af82d94e480ca30ae2f85ef369232d5b1775fefb16132ff94

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