Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ce82bc4a15eb11b…

MALICIOUS

PDF

85.1 KB Created: 2021-09-19 03:26:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c441f16f14a1e92b8aaa6c03e9a3f1db SHA-1: 5f57b0e04b0ae9051e14f0f620f843064f235321 SHA-256: 1ce82bc4a15eb11be6a4d49acb8704d70e40f53a3739f6e6d95119cd59f040c6
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of numerous links suggests an attempt to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/cc5e315d3095902143adfd31ee68317e/fivojoz.pdf In PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/93666583581.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/78249915019.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/966939021.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/19406200429.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370bc74b238---1720237999.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/xobemulezimovobaxeg.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/ritavon.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7af9e8000---jutowuzarubegak.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/18477673089.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/dunazixaxotobeperoderof.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/62889051474.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/rubopovarabuzokisaxeneve.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/82686167223.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/nuvadupa.pdfIn PDF document text
    • http://celesteandtorsten.wedding/images/file/tifixukosikuzegawifale.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/80647391274.pdfIn PDF document text
    • https://vyrukrc.lt/userfiles/file/wujopexotinaparikit.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/mefuraw.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/59647256964.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/nafovimifikaxowuruwi.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/35650113216.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/gasawifokisowag.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/verasezofivukup.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/73963865915.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=play+store+settings+apkPDF 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_off0000e76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76B 18080 bytes
SHA-256: 2cc04397aa0a650eb1e74979e957c27f5e67d8f407bea04a4fcf587a6b02abe3
font_01_sfnt_off0001162c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162C 10636 bytes
SHA-256: f2b16d60eadee07c59d65299da039ea08cd91f005d6b4f02135e503531093c70
font_02_sfnt_off00012eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1