Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdc7a6a90684666b…

MALICIOUS

PDF

86.6 KB Created: 2021-07-18 15:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ed9d579d3fc9712050452b8351a21d7f SHA-1: b5a88f03525a8cd5609d359dbea6e388239cfcc3 SHA-256: fdc7a6a90684666b3be0682363d9513bb38e6a58d1839aa24d498c7e8b683abe
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised CMS uploads, indicating a link farm or distribution point. The ML classifier strongly suggests maliciousness, and the structure aligns with techniques used to host or redirect to malicious content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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://cuisinescartier.ca/upload/editor/file/patakesodosuvobib.pdf In PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/765e7522a4b5cf37cdfc0b75cadb61ef/lufidezinumuvalopujojitol.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16075edc97b986---86227346563.pdfIn PDF document text
    • http://centrons.com/uploaded/file/197121052260b68e3ee2db1.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/et1v6shgbast5n18jqq7d6c9g8/mekosimu.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/o0cdead5lvooqpm5oke5mr2vh4/nokegu.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/pq3dafuoqhd4vts4oe4eutjqa3/jinuji.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/f7abf8e208d1837e4f246bd69eda3f29/27821680062.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/5362834718.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/zuketexopaxadetirekasovi.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160babe4e50452---3720530981.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/wugajepomanapuvafewum.pdfIn PDF document text
    • http://aifamilyreunion.com/clients/59202/File/webagev.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/55d3148bc538c2710ec800cec7e63e5e/78584804596.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/pexazekixev.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/78071164500.pdfIn PDF document text
    • https://blokhol.com/upload/files/16974984900.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/2846018392.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4d99a45c---71605202327.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/sao6jbh1n1arainepk0aptoh8k/20519011243.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/a90d12f29fbf2ae0c7e5359158f0510f/55930415283.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/tikulepinaxo.pdfIn PDF document text
    • https://proxus.nl/file/jipibawuxezugurufuka.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/17940564345.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=extremely+innocent+crossword+cluePDF 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_off0000eddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105ED 18036 bytes
SHA-256: 5c5149aaa6aa217df6c5e1c6a64d9793c1cc5d424eca548412490d5c7b61d767
font_02_sfnt_off0001346b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1346B 10756 bytes
SHA-256: fd6f454d808beedc2aebedda5cf777539a82a96b4e3867e3de1f8e60dcdd9f19