Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a608272cf41acf9…

MALICIOUS

PDF

82.5 KB Created: 2021-08-20 18:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 61ee96a787430a1520bddbaca7efecf0 SHA-1: 5b3e8b3b39e7323f32431768a061df1b03f3375c SHA-256: 2a608272cf41acf94d058ff562d440e290367bcedc450dc2df6381b44479f1ea
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish users. Although no scripts were extracted, the nature of the embedded URLs and the detection names strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/al0f5qgd77o1d7mr6qfe6m5bmq/13148998598.pdf In PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ae0067ea1---67952704932.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/9810816472.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/195901272.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/nobinoxosatuwuwojavoguf.pdfIn PDF document text
    • http://delve-cr.com/uploads/74631789788.pdfIn PDF document text
    • http://monroehighwildcats.com/clients/40160/File/46511295319.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b7641bf4130---64989924799.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609748c055245---zozawemenobo.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/318a81415de1efef7d8dfa04840847ce/25950556655.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f90a035cd9e---nimijeroned.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/83466244280.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/e79115db89f02eb4e7de267c0d0b9ac5/xaxikul.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ada9e297b40---basonivusofiroxupaj.pdfIn PDF document text
    • http://educationexplosion.com/clients/a/aa/aae59ec6301d25964842a0067e0ae100/File/juwomagonulosalamafimel.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/ppj4mihv7a0m6sav0a8tb3l3jh/bodupifukuzakixil.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/b31e1kudhhno8njme0nkg63uor/68899336410.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/jazopazomolome.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/3874abdef9097b181eae503a6f81eb5b/kisomowibitofuz.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c969e97be3792829adc67f631affb624/ronanotutitosopifeloju.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/f13dd33bdbec7da78f2fcfa71049fa67/32517543861.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/wonekuguwudip.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/dirosenobupatusibabojubu.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/bodanojipef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=electron+configuration+for+ions+worksheet+3+answer+keyPDF 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_off0000dbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF403 17700 bytes
SHA-256: d6c4eb51c98557f1ae73dfb4c99d71b282f683e06fcf2d11527169e53fa20589
font_02_sfnt_off000121bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BC 11160 bytes
SHA-256: 5bb02634b1e6853d29a94602562dcb1cda1f72e070a86d3adcb5cf7b75dad5ca

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