Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8913d412a0181b3…

MALICIOUS

PDF

81.1 KB Created: 2021-09-19 23:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 40a7f4b10c5ce0c039232a407671c52d SHA-1: 72a5403756582296ec6b3c59ec622efcbf9bf9ed SHA-256: e8913d412a0181b346d021aeeacca86eb9febadb98658afab1c128e9577a1011
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, with several hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://xutricolor.com/uploadfile/files/jemudufunibobudejafenik.pdf
    • http://shengyaweb.com/uploadfile/file/2021091901472910.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/1923cc9e516adba3ad29aa1020d1ed2f/38390656288.pdf
    • https://prestinieurope.com/userfiles/files/13839840840.pdf
    • https://homeuu.biz/upload/ckeditor/pages/files/nadafagifolobeburitu.pdf
    • http://aquatherm-graz.at/files/74384358959.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/0b346f047ecf2f827cfb35ac95708564/4534424478.pdf
    • http://neza.cz/UserFiles/File/moworuvepitu.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff5731c8de---riwoposakuni.pdf
    • https://lombardpruszkow.pl/local/userfiles/file/zirekosovurijubosef.pdf
    • http://hoya889.com/upfile/files/20210903203236.pdf
    • https://unaizahic.com/Files/files/kogoni.pdf
    • http://krakowska98.com/zdjecia/fck/file/kilodefurepum.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132659cd7f7e---91903204240.pdf
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/93226318950.pdf
    • http://rococosofa.com/files/files/timifaxovewanuv.pdf
    • http://agavietnam.com/img/files/80012229277.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/683aeca600a018a870e046cf204f2286/76236803294.pdf
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///gurukimobowesofukefobopo.pdf
    • https://aluminiosarla.com/userfiles_arla/files/fozexefizevusovewime.pdf
    • http://sysquare.com/UserFiles/files/gifabunulanerirozodaga.pdf
    • https://teater77.nl/userfiles/file/mexinukib.pdf
    • http://jyotiacademicpress.org/uploads/file/mapatomil.pdf
    • https://www.nstoplana.rs/ckfinder/userfiles/files/56502924243.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=aplikasi+edit+video+tanpa+watermark+pc+free
    • 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_off0000d715.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD715 16792 bytes
font_01_sfnt_off0000ef2c.bin
02e65ae2ab205573e20176610c750db2eedf9b4593b211ed565e4e856daad0d4
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2C 11008 bytes
font_02_sfnt_off000108d8.bin
b604485b21f851928e422b7673e0a8d43f8865cfed507e4696fc005a14f18cac
pdf-font-stream PDF embedded font (sfnt) at offset 0x108D8 18000 bytes