Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbb50bd22fe0992d…

MALICIOUS

PDF

89.7 KB Created: 2021-09-17 17:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c30d249a8c3104fe608c0ff6bcee7db4 SHA-1: 1d33159e5b0b87ecf53bea60e07cba9d0d7bdfa9 SHA-256: cbb50bd22fe0992d795ae33efaffd37766282785084ccf1e241d16055e1dbe55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The presence of embedded URLs and the nature of the link farm indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://rintrans.com/files/pofigojobasopubozelof.pdf In PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/xofimisatodoran.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/butuvibiratekusogufodajub.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/17258185389.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/witewolotezisebone.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/3664a6b4d9c88186c4c98f19bc4efd5d/pekuvo.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/dudapuzejumep.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/1oqm9gmfde36t1496de3q35m0v/66575935087.pdfIn PDF document text
    • http://chamdure.com/DATA/files/judedep.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1613e05ea95653---84794006895.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/92094707758.pdfIn PDF document text
    • http://fitviewer.com/files/file/53515872066.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/51956b42f04516b5dcc401ffddf82a19/18271666852.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/fafobunevuzuwezesu.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109160033137079.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613720510b486---23614444820.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/28458591538.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/resefisi.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/26919330690.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/neluguvabevibemonije.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/xesukimigamafa.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/lufebavorusejakoporuje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=obb+on+sd+apkPDF link annotation
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/laxilivojodebopabutixoju.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D4 10172 bytes
SHA-256: 41f38cd465dd94f8ef11d51c77790437613ffebc7560259aebec07f4a2a86de9
font_01_sfnt_off0000e778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE778 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_02_sfnt_off0000effd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFD 16232 bytes
SHA-256: e06ebeaa2bb94d9bf14337b0794fec2c9c4a66e30291689b6f6234bfe360c8a5
font_03_sfnt_off000105dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DC 22856 bytes
SHA-256: cb7f9fcd9f44ac3aeacba285db9995c671e6ea0aac1ad403e57a276ca379875a
font_04_sfnt_off0001408b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1408B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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