Malicious PDF — malware analysis report

Static analysis result for SHA-256 6242d17fec8f3d54…

MALICIOUS

PDF

71.5 KB Created: 2021-09-17 18:32:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7a95461d7cef9b981163fde4676b408a SHA-1: 358d1ddce6a08be14bb770e160693a636bb0a00c SHA-256: 6242d17fec8f3d54f03f4850fbe7fa2a54fbcdc34b60f894d907ae092b9db18d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS uploads or disposable domains. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://giayviettri.com/img-ftec/files/jadutatubekirapabis.pdf In PDF document text
    • https://beautydent.hu/editor_up/jupunepurelorun.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/fupamigide.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/f476b0c4c194677910da08e7fd5af74e/jupulajebibozituvu.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210909110213.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/figuzajaxanebazazofu.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/3337246112.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/1aijbrhipmi8jpikv3p97kgf3b/83654027601.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/15933542703.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/namikebozupag.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/33459429465.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/darikexidijomuzuvukone.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613a168b4d087---giwejozikowuf.pdfIn PDF document text
    • http://hippodrome-compiegne.fr/www/uploads/file/45590249612.pdfIn PDF document text
    • http://ledlight-lamp.com/mingyi/images/userfiles/file/18661249170.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371e0c33e46---50200754548.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/50620812c8a5b97329e2dfcd812626b7/13690909355.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/29347138960.pdfIn PDF document text
    • http://infinity-c-t.com/userfiles/file/nanete.pdfIn PDF document text
    • http://intertravel.hu/_user/file/vijalifun.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/8837417216.pdfIn PDF document text
    • https://sealskinz.ru/files/file/vukimukukanixanowigol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=gta+5+android+version+release+datePDF 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_off0000b502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB502 16636 bytes
SHA-256: 5d7b9dd8678749754a6903f5935b8f3eadefda339c3eece716b537ea4913a79c
font_01_sfnt_off0000e04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF865 10480 bytes
SHA-256: 01a9bc8814e9a9e4c1669b5491c6c82e7d3497e354bb57fd598a6f4099e76040