Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8402ccf204313b3…

MALICIOUS

PDF

94.3 KB Created: 2021-06-26 03:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4c289bac5ae18aa0580b9eab53be0671 SHA-1: a8c79988793114c2de89c846b46da56f9468d5a6 SHA-256: e8402ccf204313b38fe56cdfaa88a9297a78fb1677b2ef2c8a8a79566d82eff6
156 Risk Score

Malware Insights

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

The PDF contains a link farm that directs users to multiple distinct hosts, many of which appear to be compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ab38868ec---veremipovagoxobov.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbab121ac9---kijuvudoxu.pdf
    • http://kcde.kr/userfiles/file/jemojaf.pdf
    • http://stardentalcare.org/userfiles/file/fipunitejilobisuvage.pdf
    • http://tebsc.com/clients/84181/File/72508116590.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b480a5537---muzagasedolisirufevowizaj.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607370a7406f1---wekawufukesebazobowaja.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ocbps15ju6a02llnjabd4h1dv0/papukurebiwuvuj.pdf
    • https://arerp.kr/data/file///56752064224.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/eaen87qt0h1d45kkdrtj1b4ubn/47850033332.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/57das029o2v80751v1gib6altd/88656874855.pdf
    • https://associazionedynamica.it/uploads/file/29690870249.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/j3cki0iud761aod6rd96pqtpf0/62928440670.pdf
    • http://boxerdapolenta.com/cmsimple/images/file/bimixejoviw.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/h45obaj4tlq01ip080bp75hnmg/48366535080.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b8422d70f75---49068886192.pdf
    • http://aep-tc.com/cache/fck_files/file/mawatese.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a705f6cac6---95603168436.pdf
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ec79c6dd4---4049170659.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bea48bd7885---senaremenodovofo.pdf
    • http://quickvideo.nl/userfiles/file/gafapexamoman.pdf
    • https://soalmatematik.com/userfiles/file/4418498022.pdf
    • https://biovuspharma.net/userfiles/files/pupirot.pdf
    • https://augsburger-dartliga.de/uploads/file/kazivedilupekelekabi.pdf
    • http://spreewaldatelier.de/img/editor/file/kofoz.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780afa27fb0---kulupuzenop.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=the+leave+taking
    • 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_off00011171.bin
f51acd4c47f96a456b8af2e3a465810df88bccc91ed737246cbae0de938ecd4c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11171 16876 bytes
font_01_sfnt_off00013d5d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D5D 16792 bytes
font_02_sfnt_off00015574.bin
936c204e7fe20c87731400a06f309ff3f20c6695491c238f439c5b570824de59
pdf-font-stream PDF embedded font (sfnt) at offset 0x15574 10120 bytes