Malicious PDF — malware analysis report

Static analysis result for SHA-256 211e61a509782830…

MALICIOUS

PDF

115.3 KB Created: 2021-07-27 08:19:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 2a65a0f635a2369d4542105e544e7ad6 SHA-1: 3d6d10f28777457440d3c1b617cca19dd18f0916 SHA-256: 211e61a5097828306e9f7ce3758af0b2defff42ac0c1feca5841c0882b80eb34
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution attempt, likely using embedded JavaScript to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://metallpress.info/files/50529740786.pdf In PDF document text
    • http://hi-techfiber.com/userfiles/file/42282734508.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/2547087372.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/c1d0bcd024e15654f0dc3a89978dac23/14453704020.pdfIn PDF document text
    • https://cantellodetersiviprofessionali.it/uploads/file/5299163107.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/3069c3a2b76f507988d27def3dfddacb/95803290681.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/dobasazibil.pdfIn PDF document text
    • http://titusrelay.com/clients/e/ef/ef304ccc03541e9e6382bef5f13b0a7d/File/bovaxowumojupijosu.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/83666d491979bd0b331b6649bab7b87f/gizikudazumopokabo.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d55cb98424---runinugen.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd7ac311c0---mavuxasapodubaf.pdfIn PDF document text
    • http://www.heksan.com.pl/file/63313619088.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/06/23/file/20210623_103550_155.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/5b1d40b1f235f202c399a0828c21528d/waboviroxajonazixakozamum.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/72478733763.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089cb91493d5---25660845314.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/relexetolureturuzupedadi.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609719cb7a5bc---56885509784.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e12b56f43---winarina.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/700j10jcaa2g0t3ddampi3ui74/rojutugij.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/jidamefanivubuwosubotuto.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202107060818585233.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/suzewozera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=ryobi+10+inch+table+saw+bts10+manualPDF 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_off00016102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16102 16948 bytes
SHA-256: 76629ff0b0c9a9275810dccc6b717ff3c7a0d4f37744a150992c8bc4c3ae713d
font_01_sfnt_off00018d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A549 11056 bytes
SHA-256: a3cefb97c384ade1a88a5d31a21afff47a1132a0e2a605b99aa3e335ef27ad99

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