Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aab7995c8a671e7…

MALICIOUS

PDF

84.2 KB Created: 2021-09-06 21:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6248f012edaff9d3696c29ea5f1c61b3 SHA-1: 4d1a666fdc16d813e139dad4769fc127e5070f3b SHA-256: 5aab7995c8a671e764422523cd6107b2f1113d3b619b226faa43fbdab9e8b95c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites. No scripts were extracted, but the structure and URL patterns are consistent with phishing campaigns.

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 http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720ae9b365e---11872046116.pdf In PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160beee1defb6d---10025043503.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16084d03490777---semoguzol.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/heuqb485p60sj2lt3pfeeqk4g8/bajagusi.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5bd7b724c---dirojo.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/xutomixowuguredafomuxo.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc33ec6201---62730471476.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/0ce1e5f92b734626ee9666bb080ba4db/dapuliroza.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161081825aa53a---kizupinoxuvukapejinulir.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/62241128642.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/nobamenife.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/63146013051.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/0c4a8830f73b48092feb091a12820a8b/ninerabazupibuvamug.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/21855763765.pdfIn PDF document text
    • http://magrubber.com/images_upload/files/60542537451.pdfIn PDF document text
    • http://slsnn.ru/content/file/bopizuzunevirit.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160db7812c8115---nabixupitovuteragurupew.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/52876859843.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/kewuj.pdfIn PDF document text
    • https://jotelek.hu/files/file/14098581081.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/lenovedosotanuripa.pdfIn PDF document text
    • http://riph.pl/userfiles/file/rekevidor.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609487a3c581f---wipisamotefu.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/nifozumojutufojejuwit.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/6dec3fc9084bcb497c46bb86f26888a0/56902872069.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=2012+honda+civic+si+manual+transmission+fluid+capacityPDF 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_off0000e086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE086 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89D 11232 bytes
SHA-256: 025557c3e3b47b5690fbe91e70247cf17705b64f75f943c105c016ad863f91b5
font_02_sfnt_off000112cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CB 18196 bytes
SHA-256: ad441f479ba79edb3c3032c2d1fa8da0ca70684db2065e3b36d1dd907e7218e6