Malicious PDF — malware analysis report

Static analysis result for SHA-256 82fe5e228dc2bd30…

MALICIOUS

PDF

85.9 KB Created: 2021-06-28 09:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 95d70c647ec9d7cc641362088155081a SHA-1: 94dc21bd9c5e1e83335f967a3f2698c2c5a2be06 SHA-256: 82fe5e228dc2bd305087c0fd2dcdffa9f929f0515c4b173a3284954760650c96
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous URLs, many hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple links on disposable or compromised hosting suggests an attempt to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16098477a4ff8b---miwudemevazozikonekurobi.pdf
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/6d0bf4a18749b0873036b6d1b34dbaab/kusixabijewod.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/mm47kh7el7emjq0tbugqj8goj0/86821517883.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2cbb43aac---vetepedojabad.pdf
    • http://ccspevents.com/clients/24998/File/kejuzuxifonubapuwok.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c62dc8359d5---tugawarozifunu.pdf
    • https://aduanaldelvalle.com/userfiles/file/miwamonoroteto.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe6c54ecc8---viravuzip.pdf
    • https://unosms.us/userfiles/file/6566486654.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf828bc5c8---lebafogebiwavekox.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/5tvr0cepksj1f2o7k951g9qna7/fopotomegewabozefa.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a336489b3b7---80061601832.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/9671158e64241dfbc8586284f68e51b6/50359587262.pdf
    • http://kulturazebrak.cz/userfiles/seladufamajutakunebamaxem.pdf
    • http://zimaletto.com/uploads/file/wukagagipufo.pdf
    • http://stl-hk.net/userfiles/77652891513.pdf
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/ccf5587ed00871e4da759150c2c3f523/59783811702.pdf
    • https://sinhadventure.com/uploads/file/10336964706.pdf
    • http://taitung-house.com/CKEdit/upload/files/80462960449.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/06b53ea5a4e9e82631ba9738005c3e56/90182318304.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a46f33d58---49551156805.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbae7f33fa---56123516831.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cd792f1ef99---supalemasunulotasin.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=solutions+elementary+student%27s+book+2nd+edition+answer+key
    • 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
font_00_sfnt_off0000d69b.bin
cbf0bb64f7637f36c66936f4e34f442fac7166ab45853401aefbb0ffc45cb7b0
pdf-font-stream PDF embedded font (sfnt) at offset 0xD69B 11168 bytes
font_01_sfnt_off0000f0d2.bin
091c2e49077342202ebeaa9a9b0799b36719ad48ddbcbdf59768a22db03c27fd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D2 23028 bytes
font_02_sfnt_off00012673.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12673 16792 bytes
font_03_sfnt_off00013e80.bin
f7df1348ab19f3d86e9291f9fcf1d7a066dc2c09f1d843a1b6024f3cd88a3000
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E80 1952 bytes