Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ba081d3e68faaa2…

MALICIOUS

PDF

84.9 KB Created: 2021-06-30 05:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7c034096244bfb54f6cbee9dcd6d2ccb SHA-1: e8ca13b1097e5c165fae980f4778668de3a74a9b SHA-256: 1ba081d3e68faaa2e63747ee51eb039a8864aef9285e9452fa896554d0553eda
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other domains, likely for phishing or SEO manipulation. The presence of external URIs and the nature of the link farm suggest an attempt to exploit user trust or search engine algorithms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://cructi.ru/uplcv?utm_term=principles+of+comparative+politics+answers PDF link annotation
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c117b1ca65e---xezagikogedesezopes.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35e521682d---15692278409.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/a9230c9e3a35d937360cc2afd667f15b/21673356439.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/4909b9d45a540866bb6661820a078f27/zupijamisup.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/27ef1580faa1d66384f4f427e05a17e1/99242910687.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/edb18842bcc51d7d3cdf02392b4521f7/zupepuwuvom.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/49243478324.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es//ckfinder/userfiles/files/26584384125.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1609499166e6fc---xikijitutuli.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/6387311438.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bufelabagapul.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/6jv0emuce13phsls9uou3njciv/50620868492.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/xabawig.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/4f0b583819a44d146a3f3358377291d6/mopibeb.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/vijiretajanumesozi.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/zefedowefape.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd00a8c63e---8816563157.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088241134c7c---mifewaliweradujawavu.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/losowasomewudowixoxi.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/e60c2dd5d33f32bb53c059a2173e6832/15967350518.pdfIn PDF document text
    • http://dentherapia.hu/files/file/wopumijuzegogajowe.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/c6ed4f701b7574e5584ade7ec26a9aaa/71621331729.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_off0000e970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE970 10796 bytes
SHA-256: 49674e21ce62424de34fb4413e65b558d503db53568817b9c5f2b63d0819f907
font_01_sfnt_off00010254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10254 16760 bytes
SHA-256: 7d0efc636c5fc0f9b2c87eff3c8d0f36ce5a43eec0921476f522b1213951e414
font_02_sfnt_off00012e13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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