Malicious PDF — malware analysis report

Static analysis result for SHA-256 3013ff5fefa91e21…

MALICIOUS

PDF

91.6 KB Created: 2021-07-14 02:34:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4fae646436164af37d81752dbe9bccc2 SHA-1: 4c017f2f1fe02337bd35b475a31df1cac1fd3857 SHA-256: 3013ff5fefa91e21066463ca78e45351635b21807c56b1c206cc2a5e4acd409c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous external URIs pointing to compromised or disposable domains. These links are likely used to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://irlanc.ru/uplcv?utm_term=insert+page+between+pdf+online PDF link annotation
    • http://ohana1bbq.com/uploads/files/moxamujazek.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/gaxataxewizuv.pdfIn PDF document text
    • https://webmenuplus.com/images/file/22010526347.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/gqi1oa2i77jvrrb6glqgbbh1op/ledazetuze.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d5fc1b784---libivukusipeta.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/jipibapi.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/78374835446.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/vikusojire.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/famutelizininolu.pdfIn PDF document text
    • https://tanasiri.com/piceditor/file/23799243046.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/dujopa.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/q3o6nta3tpct26efadal4e5405/zixulimisuzixekodazod.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094d8955cb55---jovixir.pdfIn PDF document text
    • http://turatabor.hu/media/45513255971.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/vobepokeporuturajina.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a239ae77f7---kezujunoxemapesebuwatogep.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/ximiweruf.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/6532852dba92bcffc66494e1232f69f3/88446210353.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/18559066210.pdfIn PDF document text
    • http://cartopack.com/Images/file/xafusavadu.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/b25ae1f8f5efc58c059c095c2acd0fa0/84749344964.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac165d8a808---74232723047.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160726b8ff26aa---pititutolofuja.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/36295535298.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_off0001020c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1E 17428 bytes
SHA-256: 463d48e7694af5ba4891438914332fbb58b51fdb671d82b10ce89ee3e8876a44
font_02_sfnt_off00014824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14824 10852 bytes
SHA-256: d634ac399eee17fb51f6d73332675e49a9b33460d9350006fd22b5993ddbb9d8

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