Malicious PDF — malware analysis report

Static analysis result for SHA-256 e183d605b7f6f1b4…

MALICIOUS

PDF

96.0 KB Created: 2021-08-10 12:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c99aea0866761cf74134f0c95fd89cfd SHA-1: 2074e860e12215fa8b30d00b5f78d969f87a3105 SHA-256: e183d605b7f6f1b45f5e40dea60f3f2dee28a85ea3ef96a393042f6bd319a012
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file exhibits characteristics of a malicious PDF, including malformed stream lengths and ML classifier detection. It contains a link farm pointing to multiple compromised CMS upload locations and disposable hosting, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and URL patterns indicate a likely intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://ddtoyz.com/ckfinder/userfiles/files/69389181544.pdf In PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/9be96eb8c62180011b5e32ea3510f111/komuxebaxasaxinila.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fd5284fb7---rukawor.pdfIn PDF document text
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/42471912943.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/6cab0313fd3441e85921732e0b186b9f/3722591598.pdfIn PDF document text
    • http://tarasovfabrika.ru/uploads/file/25647267955.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/48675941362.pdfIn PDF document text
    • http://erex.hu/upload/file/kamawebapugezuxopivigowat.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/78043419465.pdfIn PDF document text
    • https://lusagroup.mobi/images/website/user/files/gegitezapijoxatipesabolif.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/molozuzanogejow.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16082dbbe97a81---zixewixoronunigitalata.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/d053db9fb14471fd9d66b7331681801b/tumafirawukapiwebebusodug.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160caf327dd88c---563932790.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/25697577691.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c7388b8f5df---37231861060.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/roripajejutukagitopu.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/7gd9f30eqekcgab27etrkeh67f/fosiwabeduv.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/kesamejexavif.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/6200185583.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/9lpbbkainqfcsuob39skp9j0se/nibus.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/30341673795.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=nursing+interventions+for+folic+acid+deficiency+anemiaPDF 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_off0001152f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152F 16680 bytes
SHA-256: 17f715c086687369e61773298d6043c9e94eebddd23879cdf41ed06031301797
font_01_sfnt_off00014065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14065 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001587c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1587C 11076 bytes
SHA-256: b1c9eedb6cc77e5333a38e94b4eb56585833d14ddf5cee3b476c244e677eb52d

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