Malicious PDF — malware analysis report

Static analysis result for SHA-256 230e113d8839a96b…

MALICIOUS

PDF

77.9 KB Created: 2021-09-13 17:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a85a1531d92e3cabf6f9f3138b29972f SHA-1: ba618537d3ac478cf03f9359fb411253f2689eaa SHA-256: 230e113d8839a96b9791d59d45b1a16202a97fce15d6ef0501e70d4ce400937d
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of numerous external URIs and the nature of the PDF structure support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://toyotarent.tw/FileData/ckfinder/files/20210912_4D40A8D8EED37DDE.pdf In PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/rawoxetusupa.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/sekuzusodadutomuronenukos.pdfIn PDF document text
    • https://inprovitchile.com/ckfinder/userfiles/files/vipulewosasofezin.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/metuvovolimeloluzalage.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/sumisakeperejirosaregag.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5c6c63f37---wojedog.pdfIn PDF document text
    • https://polaria.cz/images/file/rivukekebabe.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/rokevaledim.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613279025817b---49402513411.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/pizudezinimaxajekepe.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/12732067263.pdfIn PDF document text
    • http://getem.eu/files/file/xogel.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/gopavikasexukeriwojabor.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613946b9f09d8---xepunezedufukobevabavutu.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/13606693839.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/tetujoseseg.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/wiveniju.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/lokox.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/77646698885.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/3914257797.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/25859504059.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/binoxib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=wps+wpa+tester+premium+android+9PDF 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_off0000cbe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE9 17184 bytes
SHA-256: bda1db120ae3e6ded1fb51bf0f97e9bbb05e7898b9060068032b8e9a273a2ba2
font_01_sfnt_off0000f8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BE 10852 bytes
SHA-256: a96ba30008f7b167f877236ca0628f153c778f058f903e7461a1c41c6ede3ee8
font_02_sfnt_off000111e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1