Malicious PDF — malware analysis report

Static analysis result for SHA-256 5454d46f9d9ba6e5…

MALICIOUS

PDF

78.1 KB Created: 2021-06-20 19:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 95588326c1b79be3a8389c876c945a81 SHA-1: 728e29f7a70c7850b5ab7ee09083ab5f38e74e82 SHA-256: 5454d46f9d9ba6e59debe151cc1d1b0cb4d48bc25737db3fb86f9f167f5f1ee3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/t5vpp7tseoings8u5li75bagb3/bexajog.pdf In PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/2a6046d3cd5740e3eb6015b04c204239/48711205914.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/joxewujixod.pdfIn PDF document text
    • http://rowanfamilyreunion.com/clients/28915/File/najila.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/lirudenurir.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcb3ae32a1---tokurimowuwujutexekazut.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/0d0d1c2d64e2c39146ef411e962cfca9/wipofarumeposomo.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/a0524353eeaf1b7afbd43d98569d1b93/xolimis.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/811351d4d05f874e226b543ef3d6769f/noguzudumo.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f97f200a7---fumaposujimiz.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834a67791f8---58364131747.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/sidijomukixonuwimafazox.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcd475eb9b---fulizaduwafejasojomaw.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/o20p02gqdqsrou40qhmlbn03u1/66017260589.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/t32553th4qmngk54ikhn6lc1p6/93658446555.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=conjuring+2+full+movie+in+tamil+isaiminiPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000e7e1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE7E1 11828 bytes
SHA-256: 3e689933a7bbd4045a6dc4277be1b554246df662b315d613da05b41ed2840202
font_00_sfnt_off0000d608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD608 5260 bytes
SHA-256: d381975b900e724ee5993135ebf55a7968087729fdf02d23b9f7bdcccb9baa5e
font_02_sfnt_off000104b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B5 11668 bytes
SHA-256: 4535cd80c281d9ddddadcfeacfb54ee6ca31df79f3ea4ab417c7e6c54d66d551