Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1f4f028fa4e34b1…

MALICIOUS

PDF

67.6 KB Created: 2021-10-02 10:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4c8eb7faa86f5408043d865305aee59b SHA-1: 79cccb352f16a93064b9054e1cd3387027b0de59 SHA-256: d1f4f028fa4e34b1162b02f4ea120e232c856fef7a1019cf8c6b181abd5408d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing to multiple websites, with several URLs hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb7ae4b8db---91108324623.pdf In PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/07pg1faqjmv3e0oe4t1judcdj4/23029578501.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/64eff824da5636bc9429cf622255db12/51236282082.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/43557170927.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/24642323924.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/71517520432.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090521045962.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/99468850455.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/42db6f51680417389a37ddf7be50d5a5/zewokoseboret.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/zibotuvoxulimipupegudevu.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/zulekosifawaro.pdfIn PDF document text
    • http://xsteelstock.com/d/files/1112833763.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/vumowukamojufewajebifu.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/29424875218.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/cf8e98sasfl86cvivnokhabt34/nepozolawupatisuwoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=describing+words+that+start+with+tPDF 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_off0000a9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA9EF 10828 bytes
SHA-256: 19fc7e2c8e190cbe371b83418f0c1b881c1f601c6fe3e1438a8045bece4f4207
font_01_sfnt_off0000c2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD5 15136 bytes
SHA-256: 5511bc046267301797f8528b70b0b9afa1c3311c08b6f5f3ae04132fdf2988a6

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