Malicious PDF — malware analysis report

Static analysis result for SHA-256 f17cde408b730f1c…

MALICIOUS

PDF

95.6 KB Created: 2021-10-06 01:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5076ef9eafa1f6cb6950a03a0cca85e6 SHA-1: b017980b8f01d6a95494ee3de5aa0bd0e955c377 SHA-256: f17cde408b730f1c181ec50ae9a6a77025a637a5d9dc5f9bbf5f2c6b29031070
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites, as indicated by the 'PDF_RANDOM_URL_LINK' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://aurorabersinar2.com/contents/files/98607746036.pdf In PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/6587731088.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/94367300480.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/mubajudabajukomafowaj.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d722f58b5c---32816269369.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/bedurusesuvepufomojunef.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/luzivunusebobobuvogefe.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/38366247887.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/mejizexeta.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/8rrqjvv27t5mkima11jfm1g6i0/8990667318.pdfIn PDF document text
    • https://kawanmto.info/contents/files/piviwaladimenewedoriwu.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/52707522454.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/bizaxilevumasezebopad.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/xuxabusejuxopem.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/65604563203.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/lazaxo.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/vegone.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/sevenajubide.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/kupatenuna.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613f84aab5a86---jenuwupa.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/serozimupafitojewiva.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/95395273296.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/kalelavu.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/47208304860.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/62128737093.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=best+wishes+for+birthday+to+sonPDF 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_off00010d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D21 19428 bytes
SHA-256: 9a9fc1a204a76bf0c6df6ad50a231aa09b0b5cb76d4560dc71e1149baf1699fd
font_01_sfnt_off00013f56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F56 10796 bytes
SHA-256: cbfb86390ead04921bb3bae898b6ffeebb2ef02757f0da8d487f817934724d2a
font_02_sfnt_off0001584a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1584A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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