Malicious PDF — malware analysis report

Static analysis result for SHA-256 a031e7aa91457af8…

MALICIOUS

PDF

75.4 KB Created: 2021-10-05 16:23:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: df9b91ba353eeb10c3afb4488df650b7 SHA-1: 8699e5da848c3bcd57fd8f65d8023ca2c2ffd3f8 SHA-256: a031e7aa91457af8b2c53932471f4ef540a43505649bac5d16c649a4cc3ab5d4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document functions as a link farm, directing users to numerous disposable domains, many of which are hosted on compromised WordPress sites. The presence of 'utm_term' parameters suggests an attempt to track user engagement with these malicious links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://crysiq.ru/uplcv?utm_term=worksheet+on+floating+and+sinking+objects PDF link annotation
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161347df17bf09---luludowawonuke.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/10778646327.pdfIn PDF document text
    • http://e-store-sys.com/userfiles/file/75878101201.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/dedumopalinavo.pdfIn PDF document text
    • https://porfic.com/fotos/file/xekubizum.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/3887404064.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/jaduxukitawuzutapanutu.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/vuwove.pdfIn PDF document text
    • https://motecx.com/images/file/vuwifesasoned.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/nebifawiluvijovi.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/tudirufixuvibovudale.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/9ba7e8f9e393ba8921402e773b31e6fa/35348043315.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/rafiba.pdfIn PDF document text
    • https://baldai.manovonia.lt/images/files/wekufatota.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/rupolex.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/giketorir.pdfIn PDF document text
    • http://hkalc.com/userfiles/4710927055.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/59169793470.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/fakinijuzakuvetomumem.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/nunopidinabir.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/b938d078369cdce7f671282c2f123094/45255498450.pdfIn PDF document text
    • http://ippon.lv/uploads/File/suzadizidefojepidatuval.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1633184084.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_off0000c024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC024 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83B 11112 bytes
SHA-256: 5e16cd43c5a2427b70be031e0989fb6a59966aaa8937f526f7106f92f16e43d0
font_02_sfnt_off0000f1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DD 18196 bytes
SHA-256: 3d76714731c749eb1ea836cdbdb9b4cac66402daeb169e3411478f4ab57771b5

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