Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd209917aac59930…

MALICIOUS

PDF

94.0 KB Created: 2021-09-04 15:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9aec8cc92838ca73fa33ece997a173a7 SHA-1: 4a6bf0a5840d90ad05fe2ddd165f9af386e8d452 SHA-256: cd209917aac59930efb0362a34ea294f1a0342145451f39af9e350002ac8d5f3
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 ClamAV and an ML classifier. It contains a link farm pointing to numerous other PDF files hosted on various domains, some of which appear to be compromised WordPress sites. The presence of multiple external URIs and link farms suggests an attempt to manipulate search engine results or distribute malicious payloads indirectly. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://oio.cn/uploadfiles/files/50122811582.pdf In PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/161211786a0241---sepogunufupo.pdfIn PDF document text
    • http://hillcresthigh1971.com/clients/9/9f/9fbf9047a6869172a982db6f42f05a9a/File/tuwafofufadub.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/752067883.pdfIn PDF document text
    • http://wfuchiomega.com/clients/4/46/46a815049f9cfb11ab63b386d19cdfb8/File/gadiludajigusarelizin.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c51098a11a7---6838517652.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/36554072423.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/bbtboras1c7mclj0dqqimli237/bitijob.pdfIn PDF document text
    • http://amandamaitland.com/images/file/63668567790.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/gikur.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/80712832954.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/navupupim.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/kigorumupepavugo.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/nuvijaw.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ddbcc15f810---57241447870.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/28589359956.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa3a3a7502---86394222283.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/to39a1ojvcjml1jet0kabbtvh0/puvotebovonaw.pdfIn PDF document text
    • https://eberli-medical-supply.ch/upload/file/6164786822.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e92b5bdd1---nolirumajexezase.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/b08f72e9bb9a14525e1bf7d341f7c027/43658457175.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/xoveli.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/bokatodaloj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=makita+avt+demolition+hammer+manualPDF 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_off00010a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001227c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227C 18444 bytes
SHA-256: 04326a973e347acaadfee1395c73650ac78921aba3f11762afbb1ff21808df6f
font_02_sfnt_off00015255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15255 10596 bytes
SHA-256: 0a0ef21315400393ce37930895f580b2cdf8eeb07ec117d867e00ef7c5090e71

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