Malicious PDF — malware analysis report

Static analysis result for SHA-256 8582da860b57075f…

MALICIOUS

PDF

87.8 KB Created: 2021-07-10 07:36:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d1492a3f741407d590352e366632d34e SHA-1: 06c1503e68e8640760e04ca72b9774dd333c9318 SHA-256: 8582da860b57075fba4cc2871aeec641a3f9ae1b3ce895c236f4859fac5b1568
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the structure suggests it may exploit PDF vulnerabilities or leverage embedded JavaScript to redirect users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://geose.ru/userfiles/file/foxetugogabojopoda.pdf
    • http://dashoernerboot.de/userfiles/napatidoseka.pdf
    • http://ccapostolicchurch.org/clients/1/19/19d200bce63520a637954fb60b162b1a/File/bejosuzamogonupebuxefo.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160782a5704a29---fepavunavifufowimexo.pdf
    • http://brownmahonefamilyreunion2015.com/clients/7/71/71b8b7811cafefaf2288418346dc0658/File/1526279859.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774bd234b48---remak.pdf
    • http://maynenkhiinverter.com/media/ftp/file/boxalemewoxuwelusupulob.pdf
    • https://beysukonaklari.com/ckfinder/userfiles/files/95015138244.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a60d952b9---fuxabatemakizorebopun.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/0de90f2c222c54786725dcead07afe9f/56101444744.pdf
    • http://taitung-house.com/CKEdit/upload/files/67410370263.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/21fdedd529f2c92f49c9ec171ad27da3/28412467769.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/56362786e8e33cc14048f964613206d2/wadujogilabofejewur.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/ffb36d65da32cf5d7c53030dc219791c/sewametejo.pdf
    • http://amexeuro.com/an3_Uploads/file/xizinum.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ad0701ce0---50400416048.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a2cc0f8f6---wunozanegilunafo.pdf
    • http://mini-garden.ru/userfiles/file/kuterivowipokobopifew.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/8vlic23iidpjuggftgh06elqqf/37494840521.pdf
    • https://dermatologie-francophone.com/userfiles/file/livexesevoz.pdf
    • http://bright-mineral.com/uploadfile/file/2021061403004534.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd7f073103---gudaseruxurokawokolegu.pdf
    • http://parejalecaros.com/adjunto/upload/fck/files/41035749482.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=linkers+meaning+and+examples
    • 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_off0000f2af.bin
0e8b9e20944b25d4875b74f629cdcf92827759b1111b98a89b28264d1c0f8783
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AF 10668 bytes
font_01_sfnt_off00010adb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADB 16792 bytes
font_02_sfnt_off000122ed.bin
70ea465ae816efafc8bb8df33d442cdd46f62eed3e9c6431d7672ded9e22b1f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x122ED 18292 bytes