Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bff24dcf0725a75…

MALICIOUS

PDF

76.9 KB Created: 2021-09-02 23:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 304f640333cdf4b7bd59cdd10a50bcb5 SHA-1: 76327effa95692c6238976828ee18c7c1735cfa6 SHA-256: 8bff24dcf0725a7512660c79d88d8a1cb7ccaba398c2b62d7dfec800689494d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting an attempt to redirect users to malicious content. The PDF structure and embedded links are consistent with a phishing lure designed to trick users into downloading further malware or revealing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 https://smidgel.ru/uplcv?utm_term=sample+space+worksheet+7th+grade+pdf PDF link annotation
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/65071319190.pdfIn PDF document text
    • http://zjpjxt.cn/upload/uploadfile/file/75401068624.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/xuxodoxogosobuz.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/15717943034.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/49091370473.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c1454b728---5863581102.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607de1072ec30---vexenowewe.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/92238294894.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/52109535337.pdfIn PDF document text
    • https://artbynela.com/uploads/file/visafenulesekasuwutexel.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/vamuzukevejotuxi.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/5bfa6e7ea54a56922f33071bf98e0321/dukeda.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16101065da2b2a---midivuvuguvasopazubaloluv.pdfIn PDF document text
    • http://chhsclassof70.com/clients/1/1f/1f6d1b94cf555b90b9f410dfa82aea5f/File/baboziwijipuga.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb7a8515c6---17789446700.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/53872806335.pdfIn PDF document text
    • http://temple.mo/userfiles/file/kijezonosulunigekabamidi.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bfafe305ec6---juwenexuxowa.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/53177795655.pdfIn PDF document text
    • https://ghnservizi.com/file/gufikeg.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-30/20210630063148442320.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/zutokasab.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/6621268328.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e4b8cb9fc---ravopu.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/a426f3900b96bf2ab552992e3b941312/tixudasixinafe.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_off0000c4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F2 17664 bytes
SHA-256: 9cb651e71a1d320c177b00c1086e8da6a7d781902b98fe320b46fa56c96b1ecc
font_01_sfnt_off0000f1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E9 11176 bytes
SHA-256: 5c784789bbbee8f914728011db500d282b3eaed459ed27dbaa259c0fee6ba012

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