Malicious PDF — malware analysis report

Static analysis result for SHA-256 866e13514249f871…

MALICIOUS

PDF

84.7 KB Created: 2021-06-28 02:29:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 57fa3daf172ce7096c859cef14e75211 SHA-1: e73770e878097a69be28efc9ef30c0b239d79036 SHA-256: 866e13514249f8715e804365a91b2523e5fd4da956c4abac8f06862cbe591ec9
96 Risk Score

Malware Insights

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

The PDF file contains a large number of links pointing to various websites, many of which appear to be compromised CMS uploads. The ML classifier strongly indicated maliciousness, and the structure suggests a link farm designed to redirect users to potentially harmful content. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://drafthe.ru/uplcv?utm_term=declawed+dog+meaning
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/4fbadb7138360e5c3d18ef0556d08590/4388180716.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/8552jjs4innt6bpqi3jbsp6r1v/76671802688.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ee96042fe---todosamunovowik.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767607cee0d---53032903939.pdf
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/tegotuzabupawudikebunade.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5b480b7b3---xebazixozipod.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/qa8hci5ecf5gtia146f67le1h3/918042529.pdf
    • https://tuvanthietke13-5.com/webroot/img/files/56640883247.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/5eda8d6272ce2841e9f4a7fd0f40565e/50398785300.pdf
    • http://sooclose.eu/upload/File/rovizo.pdf
    • http://kibbkw.com/uploads/file/31736146793.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/bd419dbf92a8995d01358ff9a7b77e48/fajifatugifa.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/b425ab0a6a952fec4e2436a514bb5b9a/tobopepusopedetesoxise.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab83298a0ab---jepev.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffcdbb75b7---36075173583.pdf
    • http://piau-po21inn.com/CKEdit/upload/files/15024444570.pdf
    • http://www.buildonhope.org/file/lowadabaj.pdf
    • http://graham1978.com/clients/79565/File/44997304914.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/9beea0ef49869ec88518954ed55f8f96/xufoziwoluguf.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/40c1415cdac6596339f607cac9eb9982/5433869913.pdf
    • http://hainescentreasia.com/images/file/dugew.pdf
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/c0a7e1014889d11c71ad0c710cf357c5/82651679113.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaa7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA7 16792 bytes
font_01_sfnt_off000102be.bin
cbed6b0c5adda78c29c1d0140a8051b82471de97fb83d044506dd50c0c80434c
pdf-font-stream PDF embedded font (sfnt) at offset 0x102BE 10436 bytes
font_02_sfnt_off00011a29.bin
f1b30626e63908747b4b5b5599c09815f68f770606601a65aaf13f8df58c3ab5
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A29 16844 bytes