Malicious PDF — malware analysis report

Static analysis result for SHA-256 28ca7ec25a2fb75a…

MALICIOUS

PDF

87.9 KB Created: 2021-07-04 03:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 48e8d756202f0c58c05fadd4f534e239 SHA-1: 21dcdc5ee5764b9bf1d90efc853e888be857fc19 SHA-256: 28ca7ec25a2fb75a9e46d5e31fc0e6aaa1f8f8814492aafc86ab7ad5d8f312a2
104 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The ML classifier strongly indicates maliciousness, and the presence of download button lures suggests an attempt to trick users into downloading further malicious content. The file's structure and URL distribution are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/a896544042be0742af75cf85849f343f/3356780034.pdf
    • http://xn--dlek-5qa.com/admin/UserFiles/file/62650470239.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bd31726bf---mozorij.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb567c3efa---riwujoro.pdf
    • https://wagaskar.com/media/20599011083.pdf
    • https://actor-conseil.com/files/file/nesoninulitor.pdf
    • http://brezov-gaj.si/uporabnik/file/wotanari.pdf
    • http://cooper1972.com/clients/b/b4/b451ebb09e7e0345645526f893d9a49e/File/musomixagizilezopal.pdf
    • http://zkpower.net/upload/files/83091190442.pdf
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4e10f3999---11614378705.pdf
    • http://redigonda.it/userfiles/files/bexubegofixesozeremirojo.pdf
    • https://cuisinescartier.ca/upload/editor/file/60739674571.pdf
    • http://www.anjhimayath.com/upload/file/tagales.pdf
    • http://highendschmiede.de/highendfiles/file/sugikuzexikupogomiremida.pdf
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/1eff9guku8rhldprkv924h8174/mipijurut.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ccea1d8eeab---68192520349.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e2a04bdbe---jesazanowigome.pdf
    • http://starlightcelebrates.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/vadofepewoguxelubam.pdf
    • http://rhodeislandalpha.com/clients/56223/File/9147995815.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085255f22a80---wizidewetabexizajigexozal.pdf
    • https://mercerapparelss.com/userfiles/files/rufopaxezazex.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16096c9df580c2---xuramuwesal.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160aefae347bc7---komopexapigujinefuma.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=the+enlightenment+a+brief+history+with+documents+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_off0000f005.bin
a13cfb286555a87f86915cfc658535071e45c86910455ec16ff18c824e2c8e05
pdf-font-stream PDF embedded font (sfnt) at offset 0xF005 18580 bytes
font_01_sfnt_off00011f4a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4A 16792 bytes
font_02_sfnt_off00013761.bin
ff479cf6c1086886b9d0587c99688d8ee8fe641896378d918e574a7269b3f245
pdf-font-stream PDF embedded font (sfnt) at offset 0x13761 11468 bytes