Malicious PDF — malware analysis report

Static analysis result for SHA-256 93e357e49b97bcab…

MALICIOUS

PDF

80.5 KB Created: 2021-09-05 11:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 16e13a2b355b297f73c8c98e579f7560 SHA-1: ba77e990722eb77c5371f153c300c592bc79cfcb SHA-256: 93e357e49b97bcab3a9577a89fc80c551761d2a8ef562c6ac25e2adc51b5f979
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, indicating a link farm designed to direct users to potentially malicious content. Heuristics suggest this is a phishing or malware distribution lure. While no scripts were explicitly extracted, the nature of the link farm and the ML classifier's high confidence score point towards a malicious intent, likely involving exploitation of PDF vulnerabilities or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://queure.ru/uplcv?utm_term=pictures+of+catholic+symbols+and+their+meanings+pdf PDF link annotation
    • http://coumert.com/images/file/42469984467.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/10126071878.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805dcb9f7b3---ruzurimebu.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cd381d14e23---906587802.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/bamufavugosawazevatelezo.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/a09ff100005d5a0b7a84a15c4504a4fe/88432158228.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/gixejakafepisadudavev.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/6112957066.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/67121254580.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/88669050318.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/povopazi.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/42604786676.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ffee314d9---limowupaxapibezoze.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/bfd3d4fa46f2f24983f6efe6e47f57ad/64748953217.pdfIn PDF document text
    • https://turbooto.vn/upload/files/97675214167.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/866a4bc6521f72e95c9dac379bc28007/dojewuwefopenedagigusexe.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/14871372988.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160778d45e373b---99994686108.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/vumuvobena.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160945cfe3baa4---zabokisiboxivubomipesujek.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/jozibofetuxabagerat.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/46348585527.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_off0000d634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD634 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE46 16988 bytes
SHA-256: a734db4c452fdfefd4dd729b2c19454a6b1b4b460d00d03e2d134ea9ae7cb939
font_02_sfnt_off00011a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0F 11424 bytes
SHA-256: 72467788b4d51ad8c4c4e865ae0477da4e5472e5bc8d23df68bcd266bf7bf06a

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