Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ea0ea0957a2aaf2…

MALICIOUS

PDF

79.2 KB Created: 2021-09-18 00:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e76de8e7eaeaaad947148f5d25889a82 SHA-1: 314141e591e267ad0296b2cb9996fbcf62ff2147 SHA-256: 5ea0ea0957a2aaf2e253f4bc6084fdc3c79d1369676c34f590cebf73de18499d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term=paid app free download apk' in one URL indicates a lure for potentially unwanted or malicious software. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://samsungdvm.net/upload/ckfinder/files/51026297300.pdf In PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614139717ff30---94093385744.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/e2f0c2e652ef9d77ca21ec018dc92e3c/nelerulegukaserino.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614059d0af8c0---56997894500.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a284bc31b---18665348861.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136250d90af6---fijisujunajigifugave.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/gerategoru.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/zosexajigebotejedad.pdfIn PDF document text
    • http://vo23.ru/upload/file/20854159464.pdfIn PDF document text
    • https://premiersuli.hu/files/files/20935010119.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210902011316.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/9018922034.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/13493983905.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419a7bf248c---rovigiluvelera.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/53751169627.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/lixamizuba.pdfIn PDF document text
    • http://minerva-collection.net/files/files/11199985450.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/796112517.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/89203040481.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/kezob.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/4542734474.pdfIn PDF document text
    • http://nature-revive.org/files/file/koduguxikum.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c700c1392---xelibofajugeliwoxukam.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58079810091.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=paid+app+free+download+apkPDF 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_off0000d3dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DC 10404 bytes
SHA-256: c3603b8f37e9f9a03707c59278b1ccebe8e2c5c12ea23c4da713d319a471cf11
font_01_sfnt_off0000eb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7E 17084 bytes
SHA-256: 9f8a343e255fa75829862c7fc5671b3ca17a928268126313642041ae9bf563d2
font_02_sfnt_off0001175e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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