Malicious PDF — malware analysis report

Static analysis result for SHA-256 91be668d80560166…

MALICIOUS

PDF

71.3 KB Created: 2021-09-29 01:38:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 0889fae9b8d2607f98d4e30247c9ad16 SHA-1: b32caae960393f0799a9630c4f3ebaa21a911a2f SHA-256: 91be668d80560166c9f3e1cf4ec2e938ef89640adb53b0cad92b08ccf4f69705
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to manipulate search engine results. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification strongly indicates malicious intent, likely to deliver a phishing lure or a second-stage payload. No scripts were extracted, but the overall structure and URL patterns suggest a phishing or malware distribution campaign.

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://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b65827b96d---rilufujevufif.pdf In PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/15d0fb8a57637cc36627405c820eb417/badunax.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/19115979006.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/80977935270.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/1844524658.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/lonuvugidowipu.pdfIn PDF document text
    • https://tessuno.com/upload/files/613ebcd1d7263.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/68212078746.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/15050855092.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/80536983196.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/29132956689.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/xirojirewelixizonuvos.pdfIn PDF document text
    • http://akgdsgfly.pretty-match.com/upload/files/4378113460.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/57005397475.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/jaxitegepor.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614be4bb260f7---98859904620.pdfIn PDF document text
    • https://slide-bearing.com/d/files/63996705264.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/nekiruxowotutatenov.pdfIn PDF document text
    • http://hueide.com/upload/files/82771861971.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/91671034902.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/novajafebisuf.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/f096aa63a964882e274a431a73cc067c/dusutas.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/tusunuximosi.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/nonumadadijaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=download+minecraft+pocket+edition+for+free+in+pcPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc673ed275---sefozomobaju.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_off0000b298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB298 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAF 10792 bytes
SHA-256: 4b1beedc708ffc3882ed7586e2b0bf44a7a7b3ec660c9cd8046854ab53608125
font_02_sfnt_off0000e383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE383 17132 bytes
SHA-256: 62bfaeda649ecf9fdfa9e53b9c1fcde72c6cc0da3dcc434c061b3b6863b3b19a

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