Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbc760e0880db82e…

MALICIOUS

PDF

88.9 KB Created: 2021-08-04 06:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: dd0406596b35096a7b6b6888b241efae SHA-1: da2f8eb41ccf4a408f63dad3010b01acee6069e7 SHA-256: dbc760e0880db82eb5c327d8a8b2a7128a573aa4ec908f32f33f2bd70bc8bba2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1569062261---lomunogap.pdf In PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/t9con3vqn5ava9ig9mk90mdern/bebofigelanokorapibukenu.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/521f970b4c345b36bf5026abd5c54322/notobojiwi.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/sejatadelowizada.pdfIn PDF document text
    • http://sequoia59.com/clients/867919/File/bozum.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/pevugesumapojozabusajene.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-18/20210518184725239008.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/pebogerubewinod.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/dakufuzedozotenawuxiluvar.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/d6ed698148209930ee298eb13376a49b/zifopojuda.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607182c69a830---60092600567.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e8e3545fd---18325346168.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/26446356410.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e94eea34f9---3893174709.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/99288578467.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/0052720f318afb5eb6da6533feade56d/85942429316.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/lunaturetiwaf.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/52ff146b41660b21b71e49cdfd18e69b/jofeweki.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/39869194468.pdfIn PDF document text
    • http://haumeaonline.com/userfiles/file/tuwudufol.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ce42dff1427---jobojukarorirewa.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/28667821446.pdfIn PDF document text
    • https://nepalaviationmuseum.com/userfiles/files/gafoxuxiripefogajafufe.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/35360732993.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/mawiliv.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/59167928923.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=presto+pizzazz+pizza+oven+instructionsPDF 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_off0000f45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45A 17880 bytes
SHA-256: 36cb55d4a839cf023ef82c3a7d4cef074a7c5b5a89f02dcf676955b02939a2e4
font_01_sfnt_off0001237e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237E 10548 bytes
SHA-256: 1b9779027285e83212fd837404271bcde5e47d214caefc2b4b399aa632b7253b
font_02_sfnt_off00013bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1