Malicious PDF — malware analysis report

Static analysis result for SHA-256 e899433c7e30952a…

MALICIOUS

PDF

85.7 KB Created: 2021-06-29 00:05:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 615ae9848e22414b4d086c85588ca46c SHA-1: e137abd2828e3e39b8ab21ce6ca02c268538a6bb SHA-256: e899433c7e30952a15ec12ab87eaa29d440298e9fd7a7ec49e93a025ab3182fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, with no clear user-facing text, reinforcing the interpretation of it being a vehicle for malicious links rather than legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=psychological+barriers+definition PDF link annotation
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606e57f562810---61532117393.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/40006319558.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/rimijinixema.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/donexatutasunidibarus.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/e532951af3946c22e279936e35d0e354/7759023324.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741c89bf831---15230682436.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/11860859209.pdfIn PDF document text
    • http://amandamaitland.com/images/file/39228455575.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/vekanemido.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/rabituxalanumok.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079042db532b---96304542089.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/wofiminiji.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210605_0E93C255AD3FCCDF.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da386223536---93501960.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16092dc3d81cc1---12850235336.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/512q7v41kfmnhhg8fiv1iqv83i/61480366074.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/kvqu5t4bcj383mk04bkdmbn6nr/60747502168.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/lorugere.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/jemujugino.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/b6c8a5dee273ae9a7a841d28f920cd9a/47566362689.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c7795669ad3---31371975057.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/xudafo.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160906c3304d5a---22781925936.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/dogokisib.pdfIn PDF document text
    • http://perfecturology.cafe24.com/upload/editor/imagefile/60903712585.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_off0000ee46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE46 16236 bytes
SHA-256: 4e3094a561335a35118a2cc632115ca1bdaf031aa6cef38b0af2595493ea4479
font_01_sfnt_off00011805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11805 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001301c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1301C 11008 bytes
SHA-256: db5f3c9d0b720dbeb3502b37d53f263751864bcf81674580aa49d577c8a4e0d8

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