Malicious PDF — malware analysis report

Static analysis result for SHA-256 58a450e809b459d4…

MALICIOUS

PDF

85.6 KB Created: 2021-09-01 15:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e3ac5313234a5977c5868cd41052d20a SHA-1: 86fa1562bfa805bee0d664a80d1737d2af0f6d6c SHA-256: 58a450e809b459d46966272660a2d1364f2c211a863ed1e9c9cdb0c98da7f16e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely intended to deliver a second-stage payload or redirect to a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://mimpishiodua.com/contents/files/63644568581.pdf In PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/722ebcbd7765c1bae6af37271be79aa6/57142910347.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/81049004366.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/51768608163.pdfIn PDF document text
    • http://mobilenmr.com/files/files/81254519013.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e91716017---wisugikopope.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16082dec7595da---zoromawag.pdfIn PDF document text
    • http://safarang.com/basefile/files/17532175822.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/69361092428.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/sagixuguluguj.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/b9638f36ec900db9ebc2582f8e0a275e/96160273149.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716c305aeca---19304795494.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/57486110826.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/3efa23c3ad5356cef335f1dabdf44eeb/batesironifojaruwebitapi.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/fodim.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/lireralalik.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/a4bd9915a56e37609deba7f674dcc96b/24043839265.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/zaxaxedetuvesarusaduvige.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/pipofafogoreri.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/g7l9l6gi0iaml48cnhjedd9n27/foxeforilemivadude.pdfIn PDF document text
    • https://lasanisports.com/files/17687154431.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16082066c643f1---23089269093.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=find+hypotenuse+with+one+sidePDF link annotation
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/92525547726.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_off0000e92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10140 17772 bytes
SHA-256: 49caa76b448dee4b891f1886354e3ec033a9bc1afcc6e7e0325c32b87fd39a48
font_02_sfnt_off00012f97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F97 10456 bytes
SHA-256: 9a48ca1ffecc11908892d5c4fa6561ced337e3cf0f0641cb89f2aff5236d686f

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