Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2861d21e0c2d2ab…

MALICIOUS

PDF

75.5 KB Created: 2021-09-07 23:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3a1668d319a49e813aba556f406e5c1f SHA-1: 88c74b76420736820b869cc201560fddf007e72a SHA-256: e2861d21e0c2d2ab43f25be10ff7d1a8f1dfac8d0900b6b7893128a4c81d5c2a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites. These links are likely intended to manipulate search engine rankings or serve as a distribution point for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd406b009a7---39648808537.pdf In PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3cab7b437---pesuluvuxexesipexi.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f623109de4d---7209794697.pdfIn PDF document text
    • http://pgpartyrentals-decor.com/clients/9/9b/9b45d36a3a4d562467d70d81bd292783/File/xidiladasolagipefazeboda.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8db774e5c---25252358215.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f560fc29ff---44947922762.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/d7e1087f56abf978868f04a7ce77273b/99910530804.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/goluvowewabifo.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d47d0b214---rifemifikebojam.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/10272122276.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/dvmehfbk9t0b2f2illv34kmpk7/kazefanebu.pdfIn PDF document text
    • https://t2sc.me/userfiles/78763799059.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b3661ec34d3---kazebubusebidara.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/xatexadevagafaz.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/13926202832.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/46709df00eeabc176fcecb7eef469e59/fawopegesudedagos.pdfIn PDF document text
    • https://galaxy-training.com/userfiles/file/5222594293.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b24bdbda1---pamodekeluzumuvejipe.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/sibixukiserojaponuditi.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f969e2f68---paduriforakop.pdfIn PDF document text
    • http://txextremecarts.com/userfiles/file/24919678535.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad351fe2f2a---pudivovizum.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/galexi.pdfIn PDF document text
    • http://wchs67.com/clients/f/fd/fd50fd9748f3592dabdfdad26f378f15/File/58415362379.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=label+the+parts+of+the+male+reproductive+system+worksheetPDF 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_off0000c2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC6 11336 bytes
SHA-256: d076dbcb1499b64f60befd9d3e7b24cca8df6cb81ec7f54f29acbe7c6eeca9b5
font_02_sfnt_off0000f550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF550 16520 bytes
SHA-256: f4e9dcc51047234854e5f8244253dbb32b459b2036be15f45f766b5c8d090f8f