Malicious PDF — malware analysis report

Static analysis result for SHA-256 d212539cc9423ef7…

MALICIOUS

PDF

105.6 KB Created: 2021-07-02 22:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 68e27c2d94ec3045f37f5f1f940fd4ed SHA-1: e3df5a3f31c0334ed372fba6e6bf8800197974f9 SHA-256: d212539cc9423ef79fdd71119657e9188d2f0f3d926728f1ad69d63accae39ed
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress upload directories, indicating a phishing or malware distribution attempt. ClamAV detected this file as Pdf.Phishing.Trojan, and an ML classifier also flagged it as malicious. The embedded URLs suggest the document is intended to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9627

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://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b03e355b52a---68899506666.pdf In PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160baffae70a63---70539032107.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/82840076592.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16084391c8ab0c---26786369139.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/xefafaminibofiruzuke.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/71157783597.pdfIn PDF document text
    • http://laduses.nl/image/file/kejobik.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/0eifjb96etb8f5bh0b1f004rt8/nepopafuzasituliwesoduxo.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1bbe0c604---kobufik.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/627cb29fc10649a443627a3fad1dae8e/pepadipigufepane.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d44d4c13a07---78633858783.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078f7581efe9---92975632938.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/06/19/file/8820766833.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3c50837dc---79385826801.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/webesirajige.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/49e7b9b0cbefb5f600b6d57a42c918ff/78811178952.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/40946187989.pdfIn PDF document text
    • https://kopari.hu/files/file/figivab.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/3302517a1d4167a4bfd362494c5cba25/gapipume.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6d47bc191---vedewafewi.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/2c81d3908ae81dabf634cb58c6421102/41426895531.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/hiqqfr0oiimaptg193r790gfj2/42308393037.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/posusek.pdfIn PDF document text
    • http://point-grey-1970-grads.com/clients/f/fe/fe7686cf254963525dc0bd811951f15e/File/fotox.pdfIn PDF document text
    • https://mollis.rs//files/69210388448.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/00c45f76b39292b7f7c122caa33bae93/gewejujigebanatomutirize.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/88efdf53ae31a3824aa2f2aea7731216/saforulevuzevonamepajesi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=set+someone+off+meaningPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000114fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012d10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D10 20844 bytes
SHA-256: 82f771217ea74c8aa832548a697742235816c58c5e89d5b504c6be4e8fa06238
font_02_sfnt_off000161f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161F5 18620 bytes
SHA-256: 062bac0165224eb696da1ba1c50b0a115d4632860d3c30d9af49641eb4859f65
font_03_sfnt_off00017f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F2F 10484 bytes
SHA-256: 154462caa6ee5807d1e3cb4446ea1dbee3b1fa783b17031d7dc8f0ccd0cc273d