Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ed429972ee8681…

MALICIOUS

PDF

92.2 KB Created: 2021-07-22 14:36:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2a03255efd3d5f5f550c98b45eb274df SHA-1: f4bc6eeb50dd06822d197a95ddae4d69b51c2f38 SHA-256: 91ed429972ee86819001d655ffbc2d867962ec5f769fae10d1ddc38f46b1007f
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links suggests a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/i90j32h4c4cttm42c1nko3j9k5/ximoz.pdf
    • http://howsonfamilyreunion.com/clients/5/57/57b8fe7d350e782a16e6afc8bdcd6467/File/ronesegukegugavanemifer.pdf
    • https://songod.vn/uploads/image/files/30070379280.pdf
    • https://xehowo24h.com/images/ckeditor/files/55267554750.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d84755d73---17381451900.pdf
    • http://zamokugrofa.sk/admin/fckeditor/file/zuben.pdf
    • http://kaztelcom.kz/ckfinder/userfiles/files/98460664911.pdf
    • http://www.aqsclimited.com/EditorImages/file/wesuxizi.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/b5ccc74e1bf16283361ae6f8ea1e14a0/jumovadatebewone.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add219d3b2b---75185524148.pdf
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vopajinorapozesu.pdf
    • http://m2mus.pro/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/41950424592.pdf
    • https://tese.in/ckfinder/userfiles/files/tepaxenuponur.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608db28a4e812---wojilupoborolimudezode.pdf
    • https://dycmc.com/DATA/upload/files/202106112132136983.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e78ebdffce---lurabugawavadog.pdf
    • https://psychologgia.pl/Upload/file/22330410421.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160783aec1c14f---fiwotixotodujob.pdf
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/24223203006.pdf
    • http://mysistermyfriendministries.org/clients/85776/File/xopepiwapeguzib.pdf
    • http://chanakyaaerospacedefence.com/userfiles/file/gokuxujisimijaju.pdf
    • http://smclassof57.org/clients/34860/File/mobopujejidaxepes.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=energy+and+states+of+matter
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000e949.bin
bb6c85f5eaf7b7a6b58446b4c9f9784fd5d97e038ae2973f7aa2c40977c3b55d
decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE949 18176 bytes
font_01_sfnt_off000105e6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x105E6 16792 bytes
font_02_sfnt_off00011dfd.bin
8e633a5a492559a55b39272be82faf491427184de2ee52a1a3110f9a615e04a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFD 10656 bytes
font_03_sfnt_off00013638.bin
721603e2f99a736ad38140f59ffb8abb303900cb5f15c4fd7c5572364c4c110e
pdf-font-stream PDF embedded font (sfnt) at offset 0x13638 16912 bytes