Malicious PDF — malware analysis report

Static analysis result for SHA-256 d155f7dcd248b760…

MALICIOUS

PDF

86.5 KB Created: 2021-09-15 14:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 58ad3d9e3c48e3025bc5ef5a60f80cbc SHA-1: 28da301945ffb5a7808ad0d9d5da71d9dc707486 SHA-256: d155f7dcd248b760afd965442f5afc87f22eefaff2a7f4921f087e521265399f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. One prominent URL, 'https://smidgel.ru/uplcv?utm_term=download+call+of+duty+mobile+apk+mod', indicates a lure for downloading software, likely a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://smidgel.ru/uplcv?utm_term=download+call+of+duty+mobile+apk+mod PDF link annotation
    • https://daotaolaixesontay.com/uploads/file/87726080598.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/mowetarupapedila.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/95037541846.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d4b9db9c1---92131053267.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/matawaxarub.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/41994830239.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/fofofizojalutegisejesu.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/23226253281.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/rebifofujatixuje.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/gujumigugulidurujozovat.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/gisemufosas.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/62238983979.pdfIn PDF document text
    • https://resicolor.com/upload/files/95927924236.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/wevijito.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210909075044.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee23d21ee0---dotegelazojafowik.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/38156305795.pdfIn PDF document text
    • http://affectif.ro/data/Image/file/71364412535.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/895709417.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/wesafukivunotapa.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/benisusejixorafa.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/88921067767.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/kuxuwun.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0a5ec5740---15486221713.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/161410f4b49ec3---34483285614.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/9lbn13e3l8ouesmellakp0s87v/xuluxexivibarowerivudus.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_off0000e926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE926 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10138 19120 bytes
SHA-256: e422dcf8a5dcfa1846fd893132b9daf3efc8f15993ee7467f022e8962aad492a
font_02_sfnt_off000132cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132CF 11048 bytes
SHA-256: 1596bd9735b2cb67570da3501522448190c607dbff275b89573259a4af27544b

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