Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1fa88fca7b6d598…

MALICIOUS

PDF

80.5 KB Created: 2021-09-08 06:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e5a405df342a149d25279d24d19dbac9 SHA-1: 213c410554da57edbf4726a0375246b55675c798 SHA-256: c1fa88fca7b6d598e383066020d5e41b34b538254f9b428b590dd9fc9e86f561
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but likely serving as a container for the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://kojeneckezbozi.eu/userfiles/file/58241777654.pdf In PDF document text
    • http://woodsfamilypride.org/clients/2/2c/2c83419adcf4927d74d3defe18342386/File/54328627438.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/rubosukima.pdfIn PDF document text
    • http://stepsforstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/niwasazogolodupimazuxopak.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607897d9d23f5---fefagosixazaderot.pdfIn PDF document text
    • http://petersonspann.com/clients/3/32/32c4b2f41fa698b5b938e848169c8dcb/File/tawomasizitirevavibolu.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea4583f48a---norokuzowazulijasezavepi.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/82530904636.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210611093010.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/limajazixejo.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/62408153398.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/tik7f15tcih1bf58tr1m9qdbbt/23084759969.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/sivurolona.pdfIn PDF document text
    • https://badrivishal.com/media/78783110885.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/28556762711.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/dazufilerawatofazenef.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/zodefetoxoperiwizovog.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/82f39d8ea0ff9a26aba3b41bfa31be6f/kosibozonudo.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/vokabiremeveg.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/12649381921.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b07323a3c2b---31991619025.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/nasigamabosorotitafekuga.pdfIn PDF document text
    • http://barksdalereunions.com/clients/869108/File/90527208960.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/80830419507.pdfIn PDF document text
    • https://ovalpolycoats.com/media/lukojowujokefetum.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/rumoxekafoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=transfer+pdf+file+from+laptop+to+ipadPDF 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_off0000d5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B0 10624 bytes
SHA-256: a89e6bbc42eece61908ea712a7191e4bf4c25216dc42d457825976078c5b6853
font_01_sfnt_off0000edea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEA 17832 bytes
SHA-256: 4c312ae70a490f66f143ac916b073ac229983baa5f808b39cbc156c440ce59c5
font_02_sfnt_off00011bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1