Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3daaa3d00ebbed8…

MALICIOUS

PDF

72.7 KB Created: 2021-09-24 14:36:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7cb0777a598539186ecdd5459a723f94 SHA-1: 1b33539c4b8eafd7d52e50e33ac72a91eb0cca0f SHA-256: a3daaa3d00ebbed8544274d859aad89a46225de26edaddf302902beec075d108
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of multiple PDF link farm indicators reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://superlitefan.com/uploads/files/jabiripabovopin.pdf In PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/60528643300.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///88629229711.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16141a62186c02---nefofimimoron.pdfIn PDF document text
    • http://skncn.com/u/files/ropakuroxafoxagal.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/11027536764.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/jisalabepomotezitat.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/97036581749.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/f61315f7c905644589cd17bb9deb01a4/51887235381.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e35c526e5e---niketuvokagiwonefolezu.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/dijokolitoritagapazijape.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/39807693144.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/febodek.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/lafabip.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/vetemafe.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/39463913170.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/12589173826.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/bopagamegadenekuv.pdfIn PDF document text
    • https://arslanemlak.com/E/file/In PDF document text
    • http://biosystech.com/pdsFck/file/79852026883.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/wezuguxekules.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/givaxoruzilut.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/bemosamiru.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/dirujalimikapepixinuluf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+reset+a+pattern+lock+on+androidPDF 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_off0000b5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A3 10676 bytes
SHA-256: 01facd930c7fceb96921376e6030ee16ac025897dfc9b042990e0375a8406e08
font_01_sfnt_off0000ce40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE40 18248 bytes
SHA-256: ab798e712fd51cf100a79eeb6f9be1b40f8a997271d1ce9fd5e92bc9729f1e92
font_02_sfnt_off0000fd37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1