Malicious PDF — malware analysis report

Static analysis result for SHA-256 f43539f822507dd9…

MALICIOUS

PDF

83.3 KB Created: 2021-08-29 20:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 045eae83e0dbf460afb2112d836c27c2 SHA-1: 387bc633c45a1e1abce6e93680cc4de1a538352e SHA-256: f43539f822507dd9b460e356c50427820f5a9f0adb3fcabdba8e7ab1e47882a2
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://royalwedding.jp/images/blog//file/vemebava.pdf In PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/d63c79a055987cc8e7cb63329fee914b/toletoral.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/6fc5a9609b8b772553bbf9093216a7d2/saxebivuroxafusixemoj.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/nuvejojemurarexojuzitetu.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/912f94a9c0475df92796ec33c5ee5bb5/rimaledokoxo.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/pafulijomilusoj.pdfIn PDF document text
    • http://93564497.com/userfiles/gadevopebajuginozofid.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/c30d0bebc3ccf5dd8d50756775332e3a/77758832379.pdfIn PDF document text
    • http://ave-france.com/pics/files/futudisowibure.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/nafulugixasuvawawoj.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/161291c44680a2---sefawasurafil.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/127ceb4dee3d55717408d17f9dc04610/32708752109.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/pekagikasununabufinidutak.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/babufeviji.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/fih3vc1gk5l6u2kb5bgcl757c3/29100848726.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ih1lb7nr5rrmr5jnlrovnkt7f4/3741152502.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/zovujisimofodidagigapipap.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/8e82b0h2l435jv5rlsig7otego/64029901915.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/34166491405.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/994df974741b209c9c94dc3059048415/xunituzorazemeni.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/14455384439.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/pekexedejodagaz.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd347231cc---vevinoniluzozudibuxefufe.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/30401387720.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=breasts+feel+lumpy+before+periodPDF 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_off0000dfcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E1 17564 bytes
SHA-256: 39753b2f0299503706ef68edecea135bc1a0581b5e5e24d07cdd1cef1b26a541
font_02_sfnt_off00012573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12573 10964 bytes
SHA-256: a7b1afde8d4f0133d2f55dc0abd5a2f4d6417b4f7487f89f5b089f68539280ad

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