Malicious PDF — malware analysis report

Static analysis result for SHA-256 250e631d4a8a369f…

MALICIOUS

PDF

82.7 KB Created: 2021-09-05 04:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a538647fb54cf3e0dd4b63db0d3c4888 SHA-1: 5b8a4ae8cb3b1fa2086522be572f536c26aaec0d SHA-256: 250e631d4a8a369fc6eeb0f04b67cb874ab0f1124125c3776edce68ee7e73539
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggest a link farm designed to redirect users to malicious content. The document body was unreadable, but the overall structure and URL patterns indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=uppsc+calendar+2020+pdf PDF link annotation
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0c112dcf2---revedeloxegamilesur.pdfIn PDF document text
    • http://m2m2design.com/userfiles/paxemivuwira.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce3edbc2b0---motukabetikupobugite.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160900d963511c---wegegugejewajiputejofagul.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609906279642b---jugifelanoxirotulezevega.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/562hviir95q40jp9m11th8qs40/mozomopexemop.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46d9f1b802---welibivovafib.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612401402952f---27769220966.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/famizol.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/zevegogajovurapifejot.pdfIn PDF document text
    • https://paymentor.nl/uploads//file/67290467916.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/zudewekotuteduranejudovi.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/buluxobaje.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/sifafowufotokuwagenup.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16088eb070707b---xewelukuviwuwobimilunuwez.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/3955bedf4b5ee3d0bd67e89d84f257d2/purikewa.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161133f3cb1a99---34098474659.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3637e7e26---volevitodasumatex.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/85715747961.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/gidejewitofis.pdfIn PDF document text
    • http://mahnomenalumni.com/clients/879209/File/purasixesozojuf.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/69902534735.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/54972980745.pdfIn PDF document text
    • http://upperdublin1970.com/clients/3/3b/3b2fb281f4756d03d37a29c41a8c1d95/File/42497423475.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_off0000ded8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED8 17540 bytes
SHA-256: 8af06701bfb8c51e95e3ce2a774e67f7698105d90cadfa4e53f49b17b32ed068
font_01_sfnt_off00010ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA3 10552 bytes
SHA-256: f68e0d2a172acedc49901612024eb1af9102854a5734fd4477a46799624d14af
font_02_sfnt_off000124e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.