Malicious PDF — malware analysis report

Static analysis result for SHA-256 de995d573054b184…

MALICIOUS

PDF

71.9 KB Created: 2021-09-01 00:07:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ed0c76f33f3345e68d706470a3b1f71e SHA-1: 3d62deb2494c663f14f42e936ecd985e87157703 SHA-256: de995d573054b184391f61341b1b819730bf20f9046a5335dfd4915ab2ccef5c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely intended to redirect users to malicious content or phishing pages. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://laborke.ru/uplcv?utm_term=marketing+chapter+2+quiz+answers PDF link annotation
    • http://laclonghotel.vn/upload/files/borupifidelunopifiwa.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/gitutosutuwotejidotezide.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/hm84gnna997c15ula1vaumhue4/97574804378.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/8390125981.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/zexarir.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d9e208f4d---bigetidibisikesawalur.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210730_053400.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/l3fg3sv37vi7k1llo262jdmal6/83561533061.pdfIn PDF document text
    • http://japan-railpass.info/images/blog//file/vuligo.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609425d275d51---sukotimiwinufefoparujilof.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/nupejaguvobalav.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/pefesibu.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/2d56d035bb605ee4b62d5c287a183be1/nujewodapobeburebo.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/jelatufo.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/situvemetogoxedirun.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/c8ea4102782fa343da9d00a65ab523d7/70323163339.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160870c73e9fe4---70898042952.pdfIn PDF document text
    • https://nadinerogger.ch/userfiles/files/kugelilolesule.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/todexepusekiwadafatibut.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/miriregezeli.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/16072886011.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/82828044728.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB889 11084 bytes
SHA-256: 8202e787716ca87c4535082e7499019795393c1c613a2b563a1b4c5d45fc08e7
font_01_sfnt_off0000d22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA40 15632 bytes
SHA-256: 2b68263e3c1ee49b169e5132823d5685eef1148c69a2883dbb0a16b43b790f93

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