Malicious PDF — malware analysis report

Static analysis result for SHA-256 53e49a77c3823d11…

MALICIOUS

PDF

80.5 KB Created: 2021-09-01 20:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: be39524913e73927d7ae15c7f75f2120 SHA-1: 462a58fe27996ef17ffa1315dfb2744f95df4e03 SHA-256: 53e49a77c3823d11b40957d85326db163ed7923267bee93c32cc19223f4643e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple PDF-specific heuristics further supports the classification as a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://needychild.org/ckfinder/userfiles/files/vafumufunofugupadepurag.pdf In PDF document text
    • http://brucemsmithlaw.com/clients/e/e2/e252bfde01ef004f685a9648d307a4b9/File/koluwoxov.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/30335994360.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/dadijegibagup.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210808165719_yewdyz.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/0bdfa88e95eafe1f10c14086ca135e2c/pulipovubigabate.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/gabuzesozig.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/gegujesekaxapoxokebuf.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17248781860.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/jepalabarogipiw.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/21285165173.pdfIn PDF document text
    • http://susutour.com/userfile/file/tatetopadovudof.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/ec1006k3i6rrohkqt3drd6t9qn/vumodozosa.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/7cfa7bcc53b8001ead2af2e909c1fe1b/vurudutemanoropaxilo.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b5396b03ca7---72621162805.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/sunibezid.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/66874204229.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/lajigixupusegonal.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/rekanuvupugamavejesivab.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/84240605720.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/kuxevegazosu.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/66338205528.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/29147182197.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=the+conjuring+1+123moviesPDF 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_off0000d08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A0 19472 bytes
SHA-256: 17846aa6d70ba6f4c7d6397da175cdf6e5d9d12225ad63ae36e285434dc6f3d4
font_02_sfnt_off00011b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B78 10972 bytes
SHA-256: d3e5e5c9fe8b6b2d22e093586dac70078aacbfb9d14ae683cb0096d13588a7e9

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