Malicious PDF — malware analysis report

Static analysis result for SHA-256 2728d3c4530a475c…

MALICIOUS

PDF

83.1 KB Created: 2021-09-06 04:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dedf64f81f5c185ba1009fef4e01a27c SHA-1: 46277d8278eadb3b2b63099b1c8612d245c21f5b SHA-256: 2728d3c4530a475c3b5f4d9393cf0fb856de0400f022236bc4ff0f934d97e541
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, characteristic of a link farm used for phishing or malware distribution. The presence of these links suggests the document's primary purpose is to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/70e7ceccbd4e80a5f08a9a51ae69a701/52757762483.pdf In PDF document text
    • http://cgl.lu/userfiles/files/xobifegikopezezamupifo.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/15679234406.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/46985248058.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/1253d2d4f3c66da9360a59104aad9962/bisotijopu.pdfIn PDF document text
    • http://sushi-belovo.ru/files/didenujo.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/zalirapigane.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/7ocitbrlcrahtl42uf1lcn3j0e/49899116400.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c1f5d0c61---zubibif.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/bizukobofifevejijanixo.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/75080941107.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/bipefavu.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/siwamoduxa.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/66136615287.pdfIn PDF document text
    • http://mobiliteit.nu/files/jolomarewemut.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/rodoxoradodamoboja.pdfIn PDF document text
    • http://opsir.eu/files/file/jelidigir.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/tabitukumojobekibunoxob.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210719072237.pdfIn PDF document text
    • http://pincodehub.in/userfiles/file/36127041769.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/jerixefesolilifu.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d900702fa---bozosunupodadowa.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/40101097324.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=bhakti+movement+in+maharashtra+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000def6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF708 17764 bytes
SHA-256: 93d6fca6da41b4d08521df92bffccf92884c79b27e1e34a2bbc20bf58090cc02
font_02_sfnt_off00012579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12579 10928 bytes
SHA-256: f836fed5f098270437f0c29b6089272e252166f5e92a0f6abcd7c91c1fc29ee7

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