Malicious PDF — malware analysis report

Static analysis result for SHA-256 175800ee82df30c8…

MALICIOUS

PDF

95.8 KB Created: 2021-07-05 01:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 058089b831fe9dbc8fe4dffb1cbbcff2 SHA-1: 1969d26b9702883f0af470f88bfa28cb7cb2d556 SHA-256: 175800ee82df30c8561f7b179958ac92d9ca2c505e8c68ccf8164e99fcee1933
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to numerous distinct hosts, many of which appear to be compromised CMS uploads or disposable hosting. The document body was unreadable, but the presence of many external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9825

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://ltssinternational.com/res/wysiwyg/file/kewasokijaderus.pdf In PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/909cf48f7d0c44716280611ea426e56f/sutalisobawederugiku.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vugupinewabogupuf.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/manosojapuvelezawipimoki.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/24869157124.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/6resefmsn1c9ln58t3v7jr7jk7/mobusotiwuzigeraj.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a14869d70c---wonifebejizonavatezufefa.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/temerajumugimu.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/3547753859.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/l785o28okkmdekh637ll1dgua5/82203448461.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105191410.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905ce9c0ef8---rozeredibowemabaludila.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/saketujudenimirur.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160997bb935598---1930026084.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1608980075a51c---tedaxupevojotoluzuvoj.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/ff152cb2d09afac0674c5913ba2e03b5/tewexofavatijaxogodaxen.pdfIn PDF document text
    • http://fitviewer.de/files/file/muxavepopidanobudes.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d390c94b8b---farozu.pdfIn PDF document text
    • https://aedwea.com/upload/foto/97461756320.pdfIn PDF document text
    • http://goref.ru/files/file/17299141403.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b51d6131c4---ruxamawolugaluvot.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607295acd33d0---81175759638.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/vipejotuzezexaxijumutoli.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/90103080124.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=attack+on+titan+ppssppPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0A 19076 bytes
SHA-256: 6a8096723be23d92150a551aee7bcdb2276f6eba7223ef8ddeaa89a3754fb8d4
font_01_sfnt_off0001202f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13846 10164 bytes
SHA-256: 6b9dd020a1ef032c04ecc87292d4b7064bdcd35a6fd9ac75dbfa9b223ae35496
font_03_sfnt_off00014f36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F36 16632 bytes
SHA-256: 680e586a1ee573e661d30ea0f7a97a8805d5b79b2e3d5282e6cd27ea8e1e9edb
font_04_sfnt_off00016642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16642 2516 bytes
SHA-256: 96bf4f35f392a4557b3a7e6346cb63e7bca2db4a2a673f4ea27fac6a62e2b38c

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