Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd9f5279e2e752bf…

MALICIOUS

PDF

100.3 KB Created: 2021-09-09 06:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e3faa3cd5b0251825144133a95da0ad9 SHA-1: 888ee57bfd99821c509f66267bc3c44b701bd133 SHA-256: dd9f5279e2e752bfbc348a16e6c8301d6343bb6e87df6d21a31677d66e9145a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues about its purpose beyond the presence of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://brigitte-farner.ch/userfiles/files/pokafuwerisogusezatibub.pdf In PDF document text
    • http://warmistore.com/userfiles/file/difemosadodotagutanisi.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/zoxozoxibozubumipukixaxid.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/butomeperikejunapuvototeg.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/49061513337.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/28657126654.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/57272270340.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/61084611816.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/dupawukevawamoge.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/1295030325.pdfIn PDF document text
    • https://apra.pl/files/file/83478401368.pdfIn PDF document text
    • https://everestart.com/images/stories/file/35230154193.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/48434139222.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fbea5bef0---1407031373.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/33818924282.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/9855797226.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613940c3d74fb---46951969280.pdfIn PDF document text
    • http://recviem.ru/img/upload/41316017215.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/juwuxurukasiburixaw.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613044df51945---80462747242.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613646d52d086---92658071443.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/temisexizalijizukoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=el+curioso+caso+de+benjamin+button+pdfPDF 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_off00011e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13650 20240 bytes
SHA-256: 608acc95268aea33fd1162b0491fd80b91bb01721dccfc7502557fe7faef7d52
font_02_sfnt_off000169cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169CF 11136 bytes
SHA-256: a4d5f595868de0907b6cf3f97bac72acde4e84ae3c95fe38915e8ecb7009c911