Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cff87fe84b8acb2…

MALICIOUS

PDF

86.9 KB Created: 2021-06-27 18:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 436346a7d1f95811dbd7ac6e0325300f SHA-1: 8ee22d13a78c1b34ce9dd9c8fd670bb6f5983f67 SHA-256: 7cff87fe84b8acb25d3de29b0877af2c9fafdf9ffdc38768192a6b732dcd08dd
156 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to multiple websites that appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest an attempt to lure users to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee9d73f995---4080706402.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838ebf31060---53548768999.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/eg2e1np4rugol1nt95rmdq91r0/7397515066.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/aqq9hjag1ovnma2b2q1p7ssuu7/60371074920.pdf
    • http://smn68.com/clients/75339/File/13687654402.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16081cc9490537---dunamosabejotaf.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c227b7bc748---80000593960.pdf
    • http://csc0731.com/userfiles/file/20210618012334_sgxh2a.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/n23j5q5g2ghlsgm90g2ssosqoi/79440753590.pdf
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/demukibedafuzidilugenuwig.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b95ed81c3c---porupobubupe.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4cf63d43c---xekamekejomewoxa.pdf
    • https://digireg.dk/upload/13304506911.pdf
    • http://dxczx.com/ckfinder/userfiles/files/20210603_164410.pdf
    • https://alihuata.com/userfiles/file/pamebudutajoxokewaxaluvap.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094897ab56a9---jajalenixorazage.pdf
    • http://menafundinfo.com/userfiles/file/87979875699.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/mts78ceuqm1uscl9b1b7hicne5/34821496861.pdf
    • http://cloverpark1960.com/clients/1/17/17c242f0968dc4bce059666b43fbd075/File/sokomazewusetufuf.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1fa58ce34---forijetimuvokuvutabokimej.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/7b8a41f5eac456183ea84d0c72a93acc/fidejikemamizevowamojuk.pdf
    • http://afgventuregroup.com/cfiles/file/18277897182.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=eastbourne+to+bexhill+on+sea
    • 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_off0000ed10.bin
a19b6e55c9bcae53f5847f20233a5b0f386ad73ed9710f7a0e2cf0da1e7c6303
pdf-font-stream PDF embedded font (sfnt) at offset 0xED10 18124 bytes
font_01_sfnt_off00011cb0.bin
ded6e3ccaf9a5c600cb75fd4cf7dce4aa49660c8dfce3ef47ef3b46326843db7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB0 10532 bytes
font_02_sfnt_off000134a8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x134A8 16792 bytes