Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7ee2f41c1e4059d…

MALICIOUS

PDF

92.8 KB Created: 2021-09-21 07:38:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c6c4684befd17ad8b9389b5682c5ab53 SHA-1: 6647670da70b8e63a3cb30fcc38a18bd56767e9f SHA-256: c7ee2f41c1e4059df1dec9cd2f9bfc61276816a8a1e78a7324482a65fc54c65d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious link farm designed to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://catamma.ru/uplcv?utm_term=best+call+voice+changer+app PDF link annotation
    • http://avanti-kuhni.ru/upload/files/godubijeketiwewolanowiku.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/lusezo.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc6c77c139---69398220051.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/d2mblurcc8kn2jvji90pqops33/batetanitiboroxaref.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/jekivujuwijesowu.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/fosekuxovadamaxodapovufa.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/kuxasabebop.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/58444728380.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/94452644932.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/kamotaneleripadijumuwu.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/jekafononukopanadovapebu.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/4387570840.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/15185117086.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/34612526100.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/filikomati.pdfIn PDF document text
    • https://oldd.adventurenetbg.com/userfiles/file/nosejudesufonedupugexor.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ddfebc5fa---widal.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/dolefikoredapaberemuzif.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/givubi.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/68666483185.pdfIn PDF document text
    • https://ptogel1.com/contents/files/30581839506.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210908085314.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_off000105dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF3 10772 bytes
SHA-256: 5b8c83f6594d14e9fff70c5a47c52548d13579cce7d9eca85b015c99be831206
font_02_sfnt_off000136c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C3 18004 bytes
SHA-256: 77de6db0f21465dfd554fc2a872572ac2cf8dff0bfc7f06fabe4a85b50dd7769

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