Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ee92adbbee3321f…

MALICIOUS

PDF

87.3 KB Created: 2021-07-20 00:24:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0fe574a62b9b39ce049dc34f6be816fd SHA-1: 7b2e310a56545d90c5a3b0d35b443fdd1937b1f9 SHA-256: 9ee92adbbee3321fa8b37ab3a3ca801ecfda0d49bb882e2706f0e6b415bb7936
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further payloads or leading users to phishing sites. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/qcoc6i3ooqnv730q89df652o94/xifimukixaluguborizulemu.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/3d5567dc3e3f5ae67b2394acbc237e9a/gulanabigunokovanejofume.pdf
    • http://zeguvietnam.com/uploads/ckfinder/files/94099776698.pdf
    • http://sosnovgeo.ru/userfiles/file/kexogenuworifu.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085ee28a9391---fukinogewopagosonitola.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b519c00c0---lejopozoxefaxuwewewinibaf.pdf
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d285b8dbc7---93471864523.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607064ea2893b---kurokigijijukibibuguro.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/stb1jtijtioa0hfd6ns65g4to2/todigidefajuduzod.pdf
    • http://pytextiles.com/userfiles/file/mafifak.pdf
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/dac6eab4419eb340c42e3e421082a8df/fokakuradedogoxuxiw.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096597fd3e5a---bojukoseguxikivujimuwenam.pdf
    • https://crpm.ch/ck/ckfinder/userfiles/files/24324029124.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/cc0a2196e76b5baf17da36004152184e/vulubuvulifarawod.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083bacb7a7a1---42673114388.pdf
    • https://grupahatak.pl/admin/_fck_files/file/72648330643.pdf
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/0dff3ea5c36e0cbefd860143e3e294ce/36392739672.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d7d76f156---45206814771.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/5b860a18c3af2cb8526fab3f43d7bbb8/55058466410.pdf
    • http://linker-apps.com/files/zowegilesa.pdf
    • http://pm-ural.com/uploads/files/koxat.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb39a6dbc39---naduko.pdf
    • http://kochamsushi.pl/UserFiles/file/65518806339.pdf
    • http://www.hydro-tg.pro/upload/file/49980689721.pdf
    • http://anipetkingdom.com/webroot/img/files/jimiferudoje.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=minecraft+how+does+a+respawn+anchor+work
    • 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_off0000efd2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD2 16792 bytes
font_01_sfnt_off000107e9.bin
d5ee5db65d7b38cec655beac3f2cc709b1cb7d39f28a59f95eec15290a41f60b
pdf-font-stream PDF embedded font (sfnt) at offset 0x107E9 10844 bytes
font_02_sfnt_off000120fa.bin
37398512ac83909a93d895c81ee8a6278bd191103992bb5be5c167bb0bddd5cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x120FA 17712 bytes