Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd913e68e1bb99f4…

MALICIOUS

PDF

84.6 KB Created: 2021-09-17 10:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: edc2f4ddbb9ebf8ddefebaa94bda767e SHA-1: 8f7fcbbd9dfb16439c82d697eee4ecee6f3f1013 SHA-256: dd913e68e1bb99f48a7e7b9a55040ca25710bb1937dbf9f203d62cec8dec2b4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall detection strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/b01b92c73dad626b943d7e7393c16708/toguwurojise.pdf In PDF document text
    • http://aurora-c.jp/files/files/nosalukak.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/xibiwitiripasidarobuva.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/18904367297.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/50902527350.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109090418213063.pdfIn PDF document text
    • https://edex.co/userfiles/files/45686451244.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/naxipapisabot.pdfIn PDF document text
    • http://geasit.it/userfiles/files/gaferimariwebelo.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/13655471779.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/60997099633.pdfIn PDF document text
    • http://teresachild.com/upload/files/24429952530.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/68178314439.pdfIn PDF document text
    • https://bor-diing.com/upload/files/64578221614.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/fenitatuvaxakizerizula.pdfIn PDF document text
    • https://worldtradezone.com/userfiles/file/49112544702.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/demifopojos.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/84102987383.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5ef1593e1---15966621851.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/mutaluruwepirinemukexisuw.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/wulezapakon.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/62475816604.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ae609njhg86daclq5ge69dob53/33826742798.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=the+colors+of+the+visible+spectrumPDF 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_off0000e2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B4 10748 bytes
SHA-256: 6f2d614bf8fab53df51bfb48f8f55edb12b65a33d625506f1ba9471a051e66d0
font_01_sfnt_off0000fb40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB40 19068 bytes
SHA-256: dc5fb6e7ec95ee75a720a49895ac6bec77613f1d02d3fc15a4edc11b2571cadd
font_02_sfnt_off00012cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1