Malicious PDF — malware analysis report

Static analysis result for SHA-256 49501b7a46a033ba…

MALICIOUS

PDF

95.3 KB Created: 2021-09-05 01:28:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 638df2eb26cbc05a36b2705ac48357a5 SHA-1: f689b6fa90cd4f01a5502ffba16e4a7a5fd954f0 SHA-256: 49501b7a46a033ba748cc02ec72816f998a6675bae787165304eb620e2a44706
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate high maliciousness. It contains numerous links to compromised WordPress sites and link farms, suggesting it's designed to redirect users to malicious content or download further stages. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating a pattern of using disposable hosting and potentially obfuscated URLs for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/0593ead4b7cc52d5c128b36db01ac9b0/zebupijebamufo.pdf In PDF document text
    • http://www.anclupnapoli.it/userfiles/file/bofagezorew.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ae438998b---90740748876.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16083dcb30f919---24221170246.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/tefaxewunusedufexux.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/xazuvutugaseloramedodile.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de591c8b8a---pemomedesesikebojetirob.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/469399053bb7c25f87a6df51c0fccd81/48154419725.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c2157fb03---malokexavikozusosebet.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/55cfb0b0f6de41e71881a23bc47e3d2d/54524203604.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920d02e3587---52292351730.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/75962075120.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-2/20210502063151589542.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/45534355511.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/44338253566.pdfIn PDF document text
    • http://www.pilartangguh.com/file/zogiso.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/98256623888.pdfIn PDF document text
    • http://cezanart.com/userfiles/file/2362249250.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/gamimazonedamaf.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/ba1faad53c26e6120106cfd699cf22ea/9492940723.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/gituvenonewinafujal.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/47528335908.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/sanonuzofi.pdfIn PDF document text
    • http://hoskinspugs.net/clients/40498/File/38773535116.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/mijotomudakodad.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d86f0d57e9---gofisukekepuxojexu.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/14856680982.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=which+is+better+for+towing+manual+or+automatic+transmissionPDF 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_off00010a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001229a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229A 11104 bytes
SHA-256: 5ccbd0201da908569b12f5ecb0ae94c57ab53157eb820b23cb0d385114b7f672
font_02_sfnt_off00013c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C5F 19052 bytes
SHA-256: f9258cc2da30a3cb3b0c1325c55ae866cbe0d2e99e5e8ef3d387a5813bdda186

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