Malicious PDF — malware analysis report

Static analysis result for SHA-256 a729f1406df56a0b…

MALICIOUS

PDF

88.6 KB Created: 2021-07-29 20:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 03d012bcce789a8d561365c7d7b9e651 SHA-1: 6b26e4ac325a6123fc0973a840a0059b8df44edf SHA-256: a729f1406df56a0b616a293e2ea56769c7c6b7486519a7a4c596b6e3bd2bdc65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure and URL patterns suggest the document is designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://matstravel.ru/userfiles/file/mukojelidukoniwizu.pdf In PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/lisuvigazumawagirunegil.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/retapovesutusukobun.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a163e70d155---lipalak.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b9921988a89---buweziz.pdfIn PDF document text
    • http://at2apigroup3.com/contents//files/sapexunonutogutedunez.pdfIn PDF document text
    • http://vinhthuan.asia/upload/files/35989140052.pdfIn PDF document text
    • https://vyrukrc.lt/userfiles/file/51298074921.pdfIn PDF document text
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/68434656028.pdfIn PDF document text
    • http://tochalco.com/uploads/files/gurinufarexifefuz.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/ludivevamapakuvowisufoji.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/0ee9f65d37eae321a8c45f92ebcd62b8/2925421300.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/51817092562.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/14019407669.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/fanurapulumidetif.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021071406264373499.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbe2777b63---jodopoxovurebaw.pdfIn PDF document text
    • https://artbynela.com/uploads/file/36404412880.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/18745bab04d044817679ac3c64ddf8c5/78834609103.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607faa83cbce5---mokizuxojanotupetomofowak.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/90959988680.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084db34d314f---sasepovuxitoduvofigiku.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/70243052864.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982fbf66c2a---35431774553.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=ver+alguien+tiene+que+ceder+online+latino+gratisPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78B 18500 bytes
SHA-256: 2eed7909c237e18866e8deed6b2fd290a2196ffc82ad0281178132cdb4f4d168
font_01_sfnt_off0001165b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165B 2768 bytes
SHA-256: ebbf9e201f1705dd58c89a79e8f84b8f05f8b12d5c8c47750de861e392db4fe0
font_02_sfnt_off000121d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D4 10760 bytes
SHA-256: 5900d01dc6e683d1e12ae3b8b412cdabdc6f8894be446c24d955f64d7da14073
font_03_sfnt_off00013a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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