Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6e563c282ed3718…

MALICIOUS

PDF

83.6 KB Created: 2021-06-28 23:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6f1646b439abd1168ae6aee5f46dc9b2 SHA-1: e591a9119aac9f71930e151a7c4621f4263b91cc SHA-256: c6e563c282ed37182acbc4250438d889c9648879b34fe2c7d7341e81064c08ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ce9d4677f---mukegerekevejenadoden.pdf
    • http://dok-vo.ru/userfiles/file/redelebawinitila.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/u53tv9lr0ch6f9humh1cc4nmcf/27027033182.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/ks53fbpuf4c29ga34nlcn4h60m/15760171631.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0f776db40---jaxezisowebakeveme.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/ik3cf3orq898ue6vkjsmncppks/pidenolokubasifebev.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/ff378f8dfaa4dc705675293d0c37d38d/kopabumimo.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/4f4d7da2035fe76b6ae616ae7da7884d/kariwalalojarotanod.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/d6f9f10e6b0ba471985d5cb9bde82c9b/43988893949.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/uv1vr6bic5ftich8nphljotg93/48614345458.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a8ea748f5---mupitudevabivixen.pdf
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/jomegenuropino.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160b20b4fb1c33---vogiwazipojavixekokaloje.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/dd6c515ce6a86d669d680c8ac8c843ef/wapif.pdf
    • http://altinay-law.com/images/file/ganun.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc80c108ef---26138803406.pdf
    • http://rehahomecare.com/upload/editor/files/45520504172.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609202a724948---wululureturipoka.pdf
    • https://mimpiindah1.com/contents//files/dixezamo.pdf
    • http://capmar.eu/userfiles/file/57129568854.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/9b800b10e541620cdca860aea5f5c937/nasuzuzev.pdf
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sibotizikepanef.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/87875112453.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=smets1+meter+reading
    • 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_off0000e656.bin
e08ebe2286c52b24c2303c63cd585ace330e194443f08b9a1b4f3bb5db8b4788
pdf-font-stream PDF embedded font (sfnt) at offset 0xE656 16632 bytes
font_01_sfnt_off000111b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x111B0 16792 bytes
font_02_sfnt_off000129c7.bin
3c3151011bd933c907c2071849f91f60a73faa9878c73fbd22f9a9bfe0a46ae4
pdf-font-stream PDF embedded font (sfnt) at offset 0x129C7 10552 bytes