Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec8f79a6341fe34d…

MALICIOUS

PDF

81.3 KB Created: 2021-09-16 15:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 655bfc29e02085e7d3d8194e7202961c SHA-1: ad589c7e9ebeafe14f33e88a6ae59e7fd2b6c0fd SHA-256: ec8f79a6341fe34d0893c49a3892e74fcfbea5ea010a772e3c88fca62992ca67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://familiegravesen.dk/userfiles/file/rulopageboduliwa.pdf In PDF document text
    • https://ferdavagnar.is/images/fck/file/22615459893.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/xezovanaguvekuro.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/nolakiboreto.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/bemabaguvukopunixojakirul.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3388eba36---47226386024.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/24843472659.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/43429732595.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/95858801890.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/zitudibupefojuvu.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/dalizimeseramuwemojuke.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/94926346381.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e59ff58857---66272749467.pdfIn PDF document text
    • https://emprenderem.cl/files/palise.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/kuzimebebemasejafipodenij.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/28185895036.pdfIn PDF document text
    • https://mauspro.net/upload/files/22859400184.pdfIn PDF document text
    • http://fitviewer.de/files/file/52383875960.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/xebamorivozere.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/13847020615.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/56419648266.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/tekuniwudel.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/41376156743.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/lulozit.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7f4d6e4f7---jewosidug.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136efc94d60f---dixemekubowibivi.pdfIn PDF document text
    • http://samtle.net/ckupload/files/dogoxif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+start+a+macbook+in+recovery+modePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B7 17272 bytes
SHA-256: 705dbb6121e0be58bd022a44622a32d7ca9a27e35850e63fb635196f4ab8c2a2
font_02_sfnt_off00011d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6E 10972 bytes
SHA-256: 919e5eeda70a0d7f891e7c5f9759a794f9293f0c8890f29675f51be467f525ae