Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d925d4188819dad…

MALICIOUS

PDF

88.3 KB Created: 2021-07-03 01:43:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7e319f28f83e8a6ea409b11c18295f8c SHA-1: 998c1e73032908b6fdfd22c9e6032117053cc742 SHA-256: 4d925d4188819dadad5cab98137dde82c6dbbc2c578e76538037fc79fead9c1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute phishing content or malware. The presence of 'utm_term' parameters in some URLs further supports a phishing or spamming campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nomylo.ru/uplcv?utm_term=howl%27s+moving+castle+movie+online PDF link annotation
    • http://banghetretunhien.com/media/ftp/file/fabidolowifomolosu.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/21352462482.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62cafbe9ee---96966165518.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160727e879ca53---lojatumexetenixuwezuvo.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/35548525133.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/u4f6bdcvvjo9m4qa1jtndh41c2/megakog.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/tapalixakediwab.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/80786420160.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/kevezugudefa.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/zotekeger.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0cdb65e03---sapugezopazijexop.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bff931ef34e---bobuguxudu.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/902af64b8a6d02761228b76ce0e805d0/51211715536.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7a0f56d34---tisiwak.pdfIn PDF document text
    • http://chhsclassof70.com/clients/1/1f/1f6d1b94cf555b90b9f410dfa82aea5f/File/22361748405.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/p0j0ii39bf5s5jkh7griuiiqbs/ravufiwuxaxurolukeza.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b91c37beb7---zavomatapokevasoxogu.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/33892855237.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/1576361319.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/torebofavumaguzip.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/81676174518.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/4e9ohb148ldai4o2gtpf7pubq5/12047350260.pdfIn PDF document text
    • 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_off0000f548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF548 10648 bytes
SHA-256: 1d134e39aa0d6d427ba0bdd9ccd9b1b5018bcdc2ba875447273f8323f392d3d4
font_01_sfnt_off00010dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D8 17680 bytes
SHA-256: d2afe5a42582e90fc82f6c4a3dbbbdb45ef6c4f328741e9ee83cd84f303ac5dc

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