Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca45b1ae14072897…

MALICIOUS

PDF

82.2 KB Created: 2021-09-22 14:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ba8c20f38113ec0513a3a7e7f28b356b SHA-1: 0dddfa23ee538a57e50390a64c82efa21dd5a8bd SHA-256: ca45b1ae14072897aa906a1e82eabdc2141d0d1ab24f3b99765d3cabfe10e859
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://mygiftltd.com/userfiles/file/dolibuvupa.pdf In PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423890a82fe---86507846029.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/29278237284.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/kudedoxafapopevub.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/xavoka.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/kapanixarakojazalidux.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7a520cf2a---gawororitef.pdfIn PDF document text
    • https://edusfera.pl/upload/file/fumorumitimumabe.pdfIn PDF document text
    • https://gosselindesign.com/images/from_fckeditor/fichiers/81888365299.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/vobevewezab.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/74850315285.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/af24d9a40decb3e655375b7f9cf73a87/69575277533.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/lopajifude.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/xagotazupuwa.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/burabibegoxipofemusewero.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/64717730896.pdfIn PDF document text
    • http://fkhd.cz/data/img/37735142766.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/9762801027.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/13374647278.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/44736889385.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/38050815489.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/72573664062.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/famamirebolejabib.pdfIn PDF document text
    • https://solturism.ro/images/file/femusewulozodofezirarej.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/novire.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=android+custom+mouse+pointerPDF 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_off0000dad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD3 18468 bytes
SHA-256: 422b735698b0532ab27cf09789d5d5ea2aeb2353e32d402b4dab5abe5279481f
font_01_sfnt_off00010acb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACB 10548 bytes
SHA-256: 64f5710740163e6e3b38831edf531f8124bdeb98a0cfc9e2e3f43a0f938f3a26
font_02_sfnt_off000122da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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