Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a13b827a54e41e3…

MALICIOUS

PDF

83.6 KB Created: 2021-09-07 00:17:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7c05e0547b3e2410c399e1592dc8679c SHA-1: 0ed7a95f41d991042767177152994b1bea028fcf SHA-256: 3a13b827a54e41e34ed52ba338630b9a4e542e66119cd5e0cd71ab00034dcba6
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to other PDF files, many hosted on domains associated with compromised CMS uploads or identified as disposable hosting. The ML classifier strongly flagged this PDF as malicious, and the presence of external URI heuristics and link farm indicators suggest a coordinated effort to distribute content or manipulate search engine results. While no scripts were directly extracted, the overall structure and URL patterns are indicative of a malicious distribution or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://queure.ru/uplcv?utm_term=c%C3%B3digo+civil+2002+pdf+download PDF link annotation
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/fetirofojibuwazikitowo.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56a93f1b84---kezewip.pdfIn PDF document text
    • http://geniuschulatutor.com/userfiles/files/86096658295.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/lexuji.pdfIn PDF document text
    • http://nikolabartakova.cz/files/file/52717294461.pdfIn PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/xodabu.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/nofilijex.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/97055238354.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16133e62867cb9---numusule.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8035fe74d7---83473506113.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160bd92c1f2ceb---86580431727.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/055819d516c7204fdd7d8876fec6e2be/19447017086.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5082f8dc66---60037065125.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/nikijawopapagosafoseleri.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210815223040658.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210517032036.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e62fcc7ab---xafumoz.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/38540949618.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/saweluzujozamaxamivun.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/ada7703feb645a85493bd7dc395ddc5c/bijogosizelu.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/52c8466fa945a75af470b29839df0985/gonezebib.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/16893778188.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/79946565309.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_off0000dc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A2 10860 bytes
SHA-256: 0727598426be8f37b5fe642d4038dda98c23dc0667dab35cfe06d446219ca99b
font_02_sfnt_off00010d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6F 19140 bytes
SHA-256: 16dbaecd72b8ca704c28da06365dd7ce557a471dc974bcc3bdfd77033c986dac

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