Malicious PDF — malware analysis report

Static analysis result for SHA-256 92c0c4d104deebbd…

MALICIOUS

PDF

78.7 KB Created: 2021-09-15 11:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ffcdee2d70df0ddb2e9f54c0a98763fb SHA-1: 16710c14f3b56856621b5f093c30a1e0ffdf8793 SHA-256: 92c0c4d104deebbd7a5ccc7186674af3465838ff015f8e08c46012242e56fb3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or engage in SEO manipulation. ClamAV detected this file as Pdf.Phishing.Trojan, and the ML classifier also flagged it as malicious. While no scripts were directly extracted, the PDF structure and embedded links strongly suggest an attempt to redirect users to malicious sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://mundolibre.cl/uploads/userfiles/files/padifarewisel.pdf In PDF document text
    • https://themalc.org/files/file/30415897992.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/muxokamumisusafefo.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/49128995709.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/gakemojamipo.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/01b770b19ab845604f6d0fe55810b9ef/32037963056.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/94041554055.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/rotisilolisofem.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/25836602400.pdfIn PDF document text
    • http://premo.at/userfiles/file/90830050028.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210913/21091316145366336198orju3gefg5.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/34928644236.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/64913490954.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161346a45859b5---xemadudik.pdfIn PDF document text
    • http://falconltd.pl/cache/file/94118284090.pdfIn PDF document text
    • http://pasted-radio.de/web/files/tixoxidavil.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/92257186187.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/b698980dee16fabb3f6c97bac7584654/wiwinosixazuxinosi.pdfIn PDF document text
    • http://workontext.ru/media/file/59456253244.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/vubezobuwepozi.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/gutasoxupozewiradajukuji.pdfIn PDF document text
    • http://ilovestory.com/upload/file/11298784760.pdfIn PDF document text
    • http://prmakeup.com/Image/files/zofutunejevaxopomozuvunu.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/danejuloxa.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/95474896000.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=good+witch+season+1+watch+online+freePDF 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_off0000cee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE5 17280 bytes
SHA-256: d04d27a2e39b263e17daec93fbff424841931912a7fa2dad02501afaac5520c6
font_01_sfnt_off0000fbca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCA 10752 bytes
SHA-256: 76839ee556099c5acc99847c2300ab7bcc911e48e31c541f496d55b88e17f137
font_02_sfnt_off00011496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11496 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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