Malicious PDF — malware analysis report

Static analysis result for SHA-256 11bc9e932a921f74…

MALICIOUS

PDF

75.3 KB Created: 2021-09-13 21:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 39f6a026bfe4207b0cbf75547b5796ae SHA-1: a1e75ca77d8dd41990dc6566b72dcf8b83e0e320 SHA-256: 11bc9e932a921f74c8c16a907662ac2a63ab6ede52d67c6e412c1512994bd217
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/voxatul.pdf In PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/c26fp5on0n91gkv03p4avjenie/92357561490.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/nivokowuke.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/xavowegumomuvovofukupetef.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/1115994318.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/8e00fb36be5cfed7366c6df9c8bfa282/xagojolejisarovilobu.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/45315dbd4e9cc80b65125692349a96d7/94410363710.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/putafunenopenoxajoradet.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/14451064221.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/merogepakida.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161394d7ec5980---rixujif.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/33506302807.pdfIn PDF document text
    • http://asja.ua/userfiles/file/68876389094.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/tigetixabigal.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/xogugakidaze.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/rapudipomiwoguwarixewiwiv.pdfIn PDF document text
    • http://krupongs.com/images/file/24196337557.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/xokekalosona.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/45029102390.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/gegazuxetiben.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/56097053401.pdfIn PDF document text
    • http://air-con.ru/upload/files/49738280010.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/kopila.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=xbox+games+emulator+for+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_off0000c1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1FF 16948 bytes
SHA-256: 69b56e9c12b32a5541e5bbc4a185c88c006a15b1b0dd2b789d3dc9c5495fc11c
font_01_sfnt_off0000edec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEC 11044 bytes
SHA-256: 36573609670af6829494261ab4d8290574cc70470dc76ca5b38d61a4b33056c9
font_02_sfnt_off00010771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10771 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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