Malicious PDF — malware analysis report

Static analysis result for SHA-256 f710a0988364d245…

MALICIOUS

PDF

82.0 KB Created: 2021-09-02 06:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4c6e9e4c9aa787c5d34229200b332fc5 SHA-1: 75ed63bc30b44d4a86bc5dfafa52d72f5872f58a SHA-256: f710a0988364d2452e1aafe0c75a79cdc0b6e0ecd6a9ec8680ddb77b482a98e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a ML classifier and ClamAV, with heuristics indicating it functions as a link farm. Several URLs point to compromised CMS upload directories, suggesting an attempt to host or distribute malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond its structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://l-max.ru/userfiles/file/81886389437.pdf In PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079eda0c9dc5---reditaf.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/34109798122.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/tokukoxuwagenemifugovod.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/161212f6378a7d---pekile.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5460339ff2---mitasivopetuvozopome.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1c86c3912---kimipapikinifiz.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/8f0f5627550ad79811543fe922137d0a/gagisotawanut.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/risegikegojofovogovojuso.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/32908256013.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/xajazoxir.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/59149153640.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/8rdlmjgve52g4ietb4c5bjt7h3/bugurebimaweganarugato.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1ac6b41e8---25158752951.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/21231938519.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/monevomi.pdfIn PDF document text
    • http://trevorhannant.com/jodepug.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/57672604039.pdfIn PDF document text
    • http://envigest.cz/upload/file/topabuzunaboli.pdfIn PDF document text
    • http://dgjst.com/upfile/file/70756776472.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/39464689481.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1271ea7a5---mowezudu.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/xekituwomejik.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/49074728129.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=what+type+of+vegetable+is+garlicPDF 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_off0000d9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F3 17856 bytes
SHA-256: 7143809a050a3ad3a808e4a293f111d7d39535bcde1abba0aad73c78bb429f6f
font_02_sfnt_off000120c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C6 10968 bytes
SHA-256: de38f91deffbe579e54441cdb71970962be3a5039e8c4839e0aeb1798486d076

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