Malicious PDF — malware analysis report

Static analysis result for SHA-256 40e7fc62e95591cc…

MALICIOUS

PDF

81.7 KB Created: 2021-07-13 10:32:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d72b17dbcfb2c3c33e2fc69222e0f97 SHA-1: 991898f0b652e69a4ee10ca4b89fd26177054eb6 SHA-256: 40e7fc62e95591cc79e90adba7d17482fb06587a5a1024eb0aeffb0f704277e8
164 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 compromised WordPress sites, likely intended to lure users into downloading malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan. The presence of numerous links to potentially compromised CMS upload directories suggests a distribution mechanism for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf6fa14807---60354164540.pdf
    • https://mysmartedu.com/uploadimages/files/16696865573.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878f706af7a---61027441533.pdf
    • http://ahs1968.com/clients/d/dc/dcea35c349c70fb55dca458fc6558ff6/File/84369029063.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/pimes.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/fece8d8ca4d899114a9a49865c2111ea/67817706097.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/ae69ee8fbc919c1da7519ee0fe84e116/jalesiw.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb8e244cd7---rewuvisajisuv.pdf
    • http://timavoshipsupply.it/userfiles/file/36226981619.pdf
    • http://iseveranscopy.com/upload/editor/file/7031009993.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba034a7f18---fubizagekad.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5591ab5b8d---1793182716.pdf
    • http://bajajsports.com/userfiles/file/nanafoxetujakev.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a421897a2c2---23483702277.pdf
    • http://ongnuocdenhat.com/upload/files/89025768129.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/saposu.pdf
    • http://krevue.cz/UserFiles/File/14097451580.pdf
    • http://metabolit-plus.ru/files/file/gitomizovakudujajaw.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca9bfacad2---90452099218.pdf
    • http://darec.sk/files/files/mamirudovunewuxamoso.pdf
    • http://anjilh.com/uploadfile/file///2021051413293123.pdf
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/62215e29d3164eb0d883ded12b5fbe2b/81060378692.pdf
    • http://aircond.md/upload_fck/file/42117878579.pdf
    • http://bakoca.hu/files/file/velogafafaraguxakok.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=assembly+language+for+x86+processors+7th+edition+pdf+download
    • 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_off0000d76d.bin
aaffd1b72a0ee295bbbfb0754dd3abe67bd6247e4d73573032f6ae3992f98832
pdf-font-stream PDF embedded font (sfnt) at offset 0xD76D 17200 bytes
font_01_sfnt_off00010464.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10464 16792 bytes
font_02_sfnt_off00011c7b.bin
b73ebab7a6ba650ab93e30ece7ea646cc9b000eaa95eaa2aa48c79d7a2dc7608
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7B 12016 bytes