Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ac7719a93fbf29e…

MALICIOUS

PDF

74.1 KB Created: 2021-08-27 23:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 45a8f0902e9d7508fabf6fca71c70d5c SHA-1: 72f884b1e037b70f784667f7bd537cd4864bcfd1 SHA-256: 7ac7719a93fbf29e07e1198d58420090fda6136740a2b3dff62170260ceba67d
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various websites, many of which are hosted on compromised CMS uploads. The primary purpose appears to be directing users to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ressourcengarten.de/azubi/userfiles/files/fobuwasupevagu.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/jqriokfagshin0nf4268t0s5st/napeporinezutumum.pdf
    • http://bonfiremadigan.com/uploads/fckeditor/file/kuvigubikewubojekaguz.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/b3af11c605390b7ebfe6769720aa622e/xosazen.pdf
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/zolumomosametepavat.pdf
    • http://www.siphonicflowmandiri.com/upload/files/83819464295.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/85c4s4dl7colqodsiqfnorpdn0/83385562923.pdf
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/28534042051.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/7c43e49d7446d55666949b289795b92e/pamixabometer.pdf
    • http://gamax-motor.cz/data/dokumenty/10640153572.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d500878d1---buzaru.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac40e87c795---54343618758.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078c4c6c7353---rarigaxolifenemefa.pdf
    • https://esperanzadeavila.com/fotos/file/xinovujakona.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609841625f974---lifegaz.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2e975e84e---82069330924.pdf
    • https://narimasu-chintai.net/jcfiles/file/xifodun.pdf
    • https://kalyna.ua/sites/default/files/userfiles/file/wopovetebaxo.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdb96d2e64---56792851436.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/2a2ddb6ae24ef0ed4467fda4618fef86/90242539577.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/517a4b5ce19b590583540fe71c4d613d/xuvuboket.pdf
    • http://allaboutdowney.com/userimages/gopojuzik.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b4d632ed7---52665800771.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/o37m3ivr1ij9k3s13invfcvmee/talulegonefakuzut.pdf
    • http://birkhoffhi.com/userfiles/files/37929540585.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=top+indicators+for+intraday+trading
    • 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_off0000c1d2.bin
c6e91f1a416e0b5499bbc4ee7d9148a59bdcf20cc31e399948fa41fbde74dbfa
pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D2 10696 bytes
font_01_sfnt_off0000da52.bin
e58791a92dd21335058c5ab74fcbc8702f3cbd030bfb17ef420808eebcdec057
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA52 15704 bytes
font_02_sfnt_off0001026e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1026E 16792 bytes