Malicious PDF — malware analysis report

Static analysis result for SHA-256 e49e7ecec3be3326…

MALICIOUS

PDF

78.0 KB Created: 2021-09-09 05:30:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 531853a30e5e962cc5acc5e5b9546ea1 SHA-1: c8afaa8852c75229e6655feacf0065186ca47ddf SHA-256: e49e7ecec3be3326727e0629b90acea3070c8b4c8012906aed4ba6988b0a000c
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, some of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded JavaScript suggests an attempt to execute code, likely to download a second-stage payload or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://altelaw.com/uploads/image/file/75317753113.pdf
    • http://www.premiumimport.nl/ckfinder/userfiles/files/nibozaxed.pdf
    • https://bursakaynak.com/userfiles/file/rerirerewaritenanira.pdf
    • https://998.geektic.com/geektic/files/voburima.pdf
    • https://alatheir.com/atheirwsfiles/file/duzegupedebus.pdf
    • http://myshiou.com/uploads/files/202109070848007881.pdf
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5107456694.pdf
    • https://akapacha.com/userfiles/file/gijatomamewip.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ead152b53f---pivorowemosamow.pdf
    • https://sskundal.com/userfiles/file/labupezujoguridupezaj.pdf
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/nidunafufabiso.pdf
    • http://dogomanhnghia.com/uploads/files/dokuz.pdf
    • http://jcbcharpentebois.com/ressource/site-image/files/wavaka.pdf
    • http://neodentpetrosino.it/userfiles/files/winezoge.pdf
    • http://bilateralmatters.org/userfiles/file/10544559651.pdf
    • http://eakqshop.com/ckfinder/images_store/files/lofokizirire.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f70bb2a2f7---26187892755.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c338ba2be---kobepukonosiwoleginow.pdf
    • http://jurabos.nl/include/editor/file/14708518460.pdf
    • https://pracowniatechart.pl/fckpliki/file/dawezepidunum.pdf
    • http://girlstown.org/files/js/ckfinder/userfiles/files/rifitotevipi.pdf
    • https://drlanda.hu/user/file/suzuvogebemulusuli.pdf
    • https://drosamahetta.com/userfiles/file/pelivog.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=android+google+sky+map
    • 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_off0000cc07.bin
c260f8e692976d287fba7c3cfd36aae6c1219989537f9d176914d8e34e4d03bb
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC07 17616 bytes
font_01_sfnt_off0000f9a1.bin
df9abfa06e85edfca57750753257e11feef30f71b20e85f244c1035ed6dd53b8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A1 10824 bytes
font_02_sfnt_off0001125f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1125F 16792 bytes