Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a5556f6c22bea40…

MALICIOUS

PDF

88.7 KB Created: 2021-08-24 04:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9c13ffa0f3b34477c194baeebeff880f SHA-1: ed59435b92e5f2315be2f6c9b96fcce4558ed76c SHA-256: 6a5556f6c22bea4062eb36a7de0c066db63cda71dcbeb58906fcb7b9bf37bcfe
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous other PDF files hosted on compromised WordPress sites. This structure is indicative of a phishing campaign or a distribution point for further malicious content. While no scripts were directly extracted, the PDF's nature as a link farm suggests it's part of a larger attack chain, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a465591ea6e---malazufazobofasokemul.pdf In PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/a76cdbb23ab2c8dffff78df1a2b9f4cb/fubuvelalo.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/d96daf189d14c69bbc8a3e93f11c9324/69154363004.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/90820985571.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/47484965279.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae890b0cad7---55627141725.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/81431768514.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/d5ae1584c6a5ff790d87bfd6ef44cdd5/6418946539.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160726dedd450a---jumoxibitorizev.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/41860291355.pdfIn PDF document text
    • https://murtenhof.ch/userfiles/files/78357348766.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/mikurezuxedafaxomor.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/motek.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/84485376067.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608044c24cad2---30325593444.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/47106326347.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0dd7ca66f---10786439614.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/67578660997.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160913ce007b4b---pozaxobuvabifasatose.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/10653286079.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/berijofare.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/tcl89qqagfqhe3qem4tlfv84gv/pepupamelevejowavoninafaw.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/44143792120.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/62107268722.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=pus+on+side+of+nailPDF 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_off0000f40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40C 18880 bytes
SHA-256: fd8552972c7741874e9cbd28caa5a23e11981b91e44145c3feffb4b689e2b905
font_01_sfnt_off000125a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DBF 10248 bytes
SHA-256: 3f9ca1f81ecb490c455ecc5897054eda910ff3339d8c36a298acb6d37677e166

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