Malicious PDF — malware analysis report

Static analysis result for SHA-256 f59a9bddef0331c1…

MALICIOUS

PDF

89.6 KB Created: 2021-07-21 03:17:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 65172e85699d9ee81003b44569286d7c SHA-1: 7558e7b9c16b892cc21807ee451042baa6ef01bd SHA-256: f59a9bddef0331c18f9486675c004bb9828cd5920072bea2a994f971a5660e8d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories. These links likely serve as a distribution mechanism for further malicious payloads, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aad73b3ddf3---wofikezodatu.pdf In PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/gg0t1jdb6aqct614ccbc0ei3h7/wikevexonuno.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/febevonodajek.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f372c4d55c---35673802306.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d615e1afc19---lazira.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160850440d1a6d---rutukogoximisoragazasaxal.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/43e7f69c1492353d6af746bc36375225/44476623290.pdfIn PDF document text
    • http://webursitet.org/Files/file/10400422584.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/f389ad34648f42745e68e5bb120df030/zotafojitupupopedo.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/24705664599391148904fe5bbf3eb74e/bojoxa.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/42eetcubm44ad7niqolj1p25v2/zanusakipexevefiromunefaz.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607899e9b2f04---56830903807.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/mekosanezozesuwusoves.pdfIn PDF document text
    • https://kawanmto.net/contents//files/75425295826.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/tobokakufedutovejul.pdfIn PDF document text
    • http://megalaserasia.com/upload///zopusidetusasirusoxozezib.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/as06ri7cfegflg7i4rj97q9qj2/laziweg.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-7-16/20210716034758994396.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/nolikedakuwikagowop.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/019147141ec32998f74f7289c24354e9/nizazafirazok.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/84979856516.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/6886e0ab7e3f4eb55f0a1533caccf6ea/bibebitiju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=my+only+one+korean+drama+in+chinesePDF 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_off0000f8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FC 18128 bytes
SHA-256: f8672a59a5148a06f93487767d6adc6f5c735b98974694277532e48196ad4a19
font_01_sfnt_off00012885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12885 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001409c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1409C 10736 bytes
SHA-256: cf2f913844f457c1d6070751dab78a7f834533fd3517f3e2eb6f7eaf3e099c24

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