Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b11305af44f4c0e…

MALICIOUS

PDF

90.5 KB Created: 2021-08-20 21:08:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5adc76d280ab819a099793fbfd88d9c0 SHA-1: 9a2f8c00e332cc440b840e4a1c6c6ae6b486ddc3 SHA-256: 1b11305af44f4c0e1e39df784bdc04a87551d710439a929593a386c42dba9c09
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a link farm with numerous URLs, many pointing to compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The presence of a 'download' button lure further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f23196517---fanepopidesimitamozuwa.pdf In PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e2580a9b79d---zimorutebobalomapeva.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/mipenaxinurifi.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/c8bb0cccadc19940be2075863d1dd59e/kozutat.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210510184543303981830.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ca1f58c9b1e---dofisinozolepefe.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/efe421a516e48d7a5d7b7e0e2bfd19c2/dibowotapakumij.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/19fa5516e6557d47a29ca59c1505eb04/xikopiv.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/92907738712.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607577f364bc9---34589843272.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/1fd3c0356f529e9793c526ebf0e93d78/50813727888.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/texatinotovig.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/906279a6654c240885a28a893103814f/muzuvonuzivoragopaso.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/89916934173.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/badezatajatofix.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/1942419379cd1e0f381389e854f7b2e0/97898068399.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b886e5108bb---ruxeloroluzawafuburolig.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/60320084660.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/okmcplaldb4blrav55rm8ttci5/24297113194.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210817094419.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/ccc177cf8a186876a859cf72c4ad1ba5/97988390223.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/tafavufos.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/bc94b16278c1c8d68995b81ca3a941d4/83056373506.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/23279033253.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/76528019661.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=marketing+5.0+philip+kotler+pdf+downloadPDF 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_off0000ea68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA68 31692 bytes
SHA-256: ebf9e722a3b8916c42565e0337d671a7d130b63cc4ba01d869b256411d2c4a15
font_01_sfnt_off000127e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FFD 11100 bytes
SHA-256: 76094a88554d5385fd583fcee8685cae9a53a440848e1b45e5216cb65a656778

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