Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5bb842772b24e0b…

MALICIOUS

PDF

84.5 KB Created: 2021-09-08 05:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6d193d59789ea90c9395493bd8880728 SHA-1: 29293690ad4ddcbdb08cfd7c69964b6abad24aee SHA-256: e5bb842772b24e0ba4fb696a4dfaf71da956ad2327fd3093463bffc0c4979044
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or to distribute phishing content. No scripts were extracted, but the presence of multiple external URIs suggests an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=toyota+auris+2010+owners+manual+pdf
    • http://alpha-th.com/userfiles/file/33982623039.pdf
    • http://teusz.pl/UserFiles/file/1732246943.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/cbd08d943f86e03c6ba92e533797c986/41412302076.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109f0b538710---wanumipigenitezolenane.pdf
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/87594505142.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/6188bbbfaac104337baabb6007ab5a7f/1137136413.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb754b9190---nupikut.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611b20d5382d4---bureralawiguxuxuz.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/up5569au1ktko9qa36bc56m6um/nekadesukilafu.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/kl1ptsnakvloua6jciq13u2v96/bexitefetojovaduzemopi.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ade79a27693---gapeluj.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa6520a413---sidagaze.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/0fb9609a2c5302777ce6a75ae7e0d6c9/26566809680.pdf
    • http://www.gpe-el.pro/ckfinder/userfiles/files/21059957801.pdf
    • http://optikametuje.cz/userfiles/file/87222820388.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c51df85deb1---92711057284.pdf
    • http://sunil.kr/uploadfile/fckeditor/file/degaruwotojisafejegeni.pdf
    • https://signika.pl/Upload/file/72354749024.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c94842de63---36466959200.pdf
    • http://forglass.sk/userfiles/file/bipapagovasi.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a757d3781ba---wekipafaredev.pdf
    • http://davidhammerstein.org/userfiles/file/77091713682.pdf
    • https://www.channeloflove.com/ckfinder/userfiles/files/jebudaguromibewer.pdf
    • http://alexanderjamesbackcatalogue.com/userfiles/file/tutupom.pdf
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/729c072a6cdfdbdb610861185b46c2c0/xebewezadaselamejorekoxan.pdf
    • 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_off0000dfa1.bin
38ceef018ed88a9cc69caaf95d3f1dbe271b6f0f9db2b2140122720677deee1e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA1 18696 bytes
font_01_sfnt_off00010fc9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC9 16792 bytes
font_02_sfnt_off000127e0.bin
3c21ade7a274a43d515a65623e076ff805c993813ea6a3199e0374a226482382
pdf-font-stream PDF embedded font (sfnt) at offset 0x127E0 11216 bytes