Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac1e044514549de…

MALICIOUS

PDF

80.7 KB Created: 2021-09-12 15:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7b9dce390cbf8f2e77f587f8432a92cd SHA-1: 1c03604ad3dc810e63dc8c69db6083f62476659f SHA-256: 8ac1e044514549de5bc85d774252441feb408e51feea593069ef0f69e1cb22f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or appear to be part of a link farm, suggesting a phishing or malware distribution attempt. The presence of a 'secret neighbor download apk' UTM term in one URL indicates a lure for potentially unwanted software. ClamAV and ML classifiers also flagged this PDF as malicious, reinforcing the phishing and malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=secret+neighbor+download+apk PDF link annotation
    • http://dogable.de/userfiles/file/watapavokik.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/57937125801.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/sabopego.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/ranozovipasadog.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/pukivesobomuzedexas.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/jojuli.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613746fd33ff8---10102626179.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/15189670389.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2a6671673---kuvedejom.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/68035641282.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4dbbc81f6---23142503781.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a116ff21a4---4239095389.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/dudipemojufesuje.pdfIn PDF document text
    • http://vucert.vn/uploads/files/21524890155.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/51777480245.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/83982662496.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/61687101921.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210902/file/16305998402168.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/bapamanosirid.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366a1c8c1ab---kebodefezojubinubumiwe.pdfIn PDF document text
    • https://strategie-forex.com/ckfinder/userfiles/files/zuxuwebava.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/wedog.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/kogemolutopizifofiwedusib.pdfIn PDF document text
    • http://mextro.de/upload/files/20700372072.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/figixogi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EC 16424 bytes
SHA-256: 9e4562b5b46cc501414db3aaebbae6dca75b5dac1874f56d538272dc4aad3a26
font_01_sfnt_off0001043c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C53 11016 bytes
SHA-256: 46d31e148081d49ecab48cb6910fdcdd5488cec4d349389d3d6fe416d5f36f6f

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