Malicious PDF — malware analysis report

Static analysis result for SHA-256 92082be54951d118…

MALICIOUS

PDF

74.3 KB Created: 2021-09-16 09:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 76f45088c413c37328a162a1a5f7a07e SHA-1: 0fec0e11bc6068581a1d80395b7202fbafa1cc87 SHA-256: 92082be54951d118daf4f86fba256ad1c367d3d55d136bdf77929a59eda486c2
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://portalbime.com/UploadedFiles/New/file/40543408409.pdf In PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/baxos.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/pukisul.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/nelapupakuti.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/jezidodogu.pdfIn PDF document text
    • https://xn--dokumaanahtarlk-llc.net/userfiles/file/kumelegezuni.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/mefafovakavezesizeviwef.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/jegupik.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/74338055714.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/a09e2f8c3ba8d9dad3c7d2d1ee3f051a/dowuvi.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb0917a4c0---46612702815.pdfIn PDF document text
    • http://bacsionline.net/userfiles/file/93105023736.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/49028271258.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/83270442346.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613155db26018---50822049702.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/31739405709.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/58807430785.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/47763842774.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/foror.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1613d51a67f232---86497563020.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/e4vsn87ql2dshg8qippqfnc07e/juxavisatet.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/53737228683.pdfIn PDF document text
    • http://findusafranchise.com/files/files/9307162790.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/32554533467.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=circular+menu+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_off0000c221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC221 16476 bytes
SHA-256: 0c5ffe3f455a40d7f34a1ce22d0842b639a4b5a0e03de7db4cc19fab441b5a5f
font_01_sfnt_off0000ec9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9D 10396 bytes
SHA-256: 2e66b40d6f4920b766246576d32bf33bd38bd9d0f158d92c8e8d5adecfad6693
font_02_sfnt_off0001040d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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