Malicious PDF — malware analysis report

Static analysis result for SHA-256 ada6b7b904e933ec…

MALICIOUS

PDF

72.1 KB Created: 2021-09-26 12:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8275f577a48306471636df87199d5573 SHA-1: 8b4047ebd7ec7dd7fcda52fe86391e08cb63b278 SHA-256: ada6b7b904e933ecec2d813bf2fd4bf10cc431f575832b38eb8bc60836e03db7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. Heuristics suggest this is a phishing or malware distribution attempt, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://catamma.ru/uplcv?utm_term=positive+words+that+start+with+the+letter+j+to+describe+a+person PDF link annotation
    • https://propertiproperty.com/Uploads/userfiles/files/kidip.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16130926759537---worerepumasar.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/wekubufuxinikaf.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/fimajenane.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/jozigebonizufar.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/71839861967.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311834804c0---66495438698.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/88341157417.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/senagusisazusonexapel.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210912_092634.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614836868b20c---donojotafetibifidoxog.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/79834642730.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109071033403624.pdfIn PDF document text
    • https://susta.vn/userfiles/file/pemejelan.pdfIn PDF document text
    • https://coevent.ru/upload/files/3276370608.pdfIn PDF document text
    • http://petrduchek.com/files/66469436739.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/t9tvttvo7ulae8h3c0rtseolel/24512100158.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/kdhn04er7f21mkcn6kk5oc5ns8/68742783047.pdfIn PDF document text
    • https://campermagazine.tv/public/file/nisemanila.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/raxijodirekare.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/50707784351.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/vibomufilotana.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/fexegi.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/pewajekamolilateji.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/butikixum.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_off0000b2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCADA 17332 bytes
SHA-256: e92ac4bf14690e11a23a60b15f9a53a46a8e970188ef1538cace015387e57970
font_02_sfnt_off0000f6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AB 11036 bytes
SHA-256: 764ccfc266c4933d1fd065eceecd1b3d9fabf1b2db97ca89ec4766edb1033f96

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