Malicious PDF — malware analysis report

Static analysis result for SHA-256 52dbff08b5356857…

MALICIOUS

PDF

82.2 KB Created: 2021-08-03 00:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3bab0384de1ccac3bc78b0e622ffca52 SHA-1: 739750f1bfdec48a4831dc7f30d6d44c117a5cff SHA-256: 52dbff08b535685788cc14853ab8d9d07b56cb7da27bae3fa110035257a658f0
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 compromised CMS platforms or disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, with the PDF being identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=thompson+and+thompson+genetics+in+medicine+9th+edition PDF link annotation
    • http://atek-ent.com/upload/file/wopozewilejoxipuso.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c49b958c3d3---bonoxuxisatiwejavojopu.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/nuzutaxemez.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086040ba404d---tuzepuzutuwuguj.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e52b614f5---xatit.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16102b001de26f---49577250141.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/46tva6d8gdni2bjn1vjsmn4br7/gowizomuxolid.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/ronabadavuj.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/uanrq2cq7tg6a1is015hc6es42/32866055952.pdfIn PDF document text
    • http://22743333.com/userfiles/files/rilomulogam.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/50745cc84e83f6acbe5b54cdf0622689/43661071361.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d40a90bbf---tukotatolejugi.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9898801c9c---52700417177.pdfIn PDF document text
    • http://kbchina.de/upload/51181662534.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202107file/2021070317471370554.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/29677141863.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/webisisifa.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/7cab830dcb6b1a67c375166a73af50d0/rusikeletibogogeb.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/25082116370.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfc8c85a6c---nudavubunile.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/jupagezadabebebutop.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/3j27podkreqjppoho2nu8s1pq1/redowotewibawipanejeta.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/visanivex.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/xizezamabovatekupopiz.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_off0000da67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA67 17480 bytes
SHA-256: 2203750d9c85af7eb596f0c29424eaa0dbd6eb2b86972dc86bbf544a6d3172ca
font_01_sfnt_off00010825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10825 10944 bytes
SHA-256: db87f7bb351720bda5c0038e7024cb26bb6b80eea8b2dd8bcdf3aaae144b69df
font_02_sfnt_off0001212e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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