Malicious PDF — malware analysis report

Static analysis result for SHA-256 adb2f2552a39d557…

MALICIOUS

PDF

74.1 KB Created: 2021-09-09 13:12:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1233c9617aae40adbeb150563b4b7297 SHA-1: 32108f34b50f06e66ba9e1750cadf732bcaa8c3f SHA-256: adb2f2552a39d557b262e105e68224e275ce7807bc63464d0ebc3abd14d52c73
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF containing a link farm hosted on compromised WordPress sites, directing users to potentially malicious PDF files. The presence of numerous unknown URLs suggests a broad distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e065463b1---kepizibunegagotojasosif.pdf In PDF document text
    • http://89928386.com/uploads/files/202109021052007005.pdfIn PDF document text
    • http://ahchala.com/img/file/45865641625.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/38428566698.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/jobajozujozap.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16135ca4f7f419---52454631740.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f159a08230---kimuto.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/dakilox.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/24810044555.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/pobuwatejamorem.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/towuweti.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68676836141.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/rabukepetepoluregewiku.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/50457540246.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/xotubowilogojafuretalaw.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/lofokutubuvejumajusubise.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/18476825315.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/66094668392.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/38646097813.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/totewabaletiboruxajilopop.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132ae5349280---zujaxilekubu.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/nonofuzonefudodurejo.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/jobitujibefisoku.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/40791256660.pdfIn PDF document text
    • https://basisnomor.com/contents/files/9932544803.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=the+last+jedi+pdfPDF 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_off0000beb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB4 17264 bytes
SHA-256: 62e279d49ac7f2e26f55c7e667c40f969019f74370fb347f28ffacef73007553
font_01_sfnt_off0000eb38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB38 10364 bytes
SHA-256: a7f3500c9d43b26e37c242ff4b91b89c9676aa50c3530dfb2277a49c55365ca4
font_02_sfnt_off000102b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1