Malicious PDF — malware analysis report

Static analysis result for SHA-256 485aee18961e1628…

MALICIOUS

PDF

78.0 KB Created: 2021-11-07 14:53:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4b2e26bdd2f19e68222fd66b6a67718b SHA-1: e91e60d3f7cc9ad78eb7fa063a55df477e8ba7eb SHA-256: 485aee18961e16282b311ac2ff0ab4876a54458c646139a4fad94c48e14f47ef
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting sites. The embedded URLs and the overall structure suggest an attempt to direct users to malicious content, likely for phishing or malware distribution.

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 https://smidgel.ru/uplcv?utm_term=du+distance+learning PDF link annotation
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/793e7bd491f973471adc3a9d31b2ad07/40097160186.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/68262270949.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/dixusuku.pdfIn PDF document text
    • https://yifff.se/userfiles/file/bedibeji.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210902101105.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/37303811228.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/vovigojebigodakafufep.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/e35d00ed510062d95de041f1297417cd/rawadezidodaxe.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/gebekewemitajig.pdfIn PDF document text
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/keripixavaze.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/rawefozu.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/pezobulanovup.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/4391258376138833c817bb.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/88797968096.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/32733983840.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/teguduwudulaxemoti.pdfIn PDF document text
    • https://ozanetiket.com/TasarimAcarnet/serhali/upload/files/suwoxu.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/11987749928.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210916163181433634.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/52211980819.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1617b1b2bb97a1---fejise.pdfIn PDF document text
    • https://mauspro.net/upload/files/54958902744.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/womavapep.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/486cef.pdfIn PDF document text
    • 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_off0000cc20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC20 10524 bytes
SHA-256: 2fe00571f135c9b4fed1a00429fda1df6025dabbfb8aa770fee23d3ef93dcf37
font_01_sfnt_off0000e3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FC 18040 bytes
SHA-256: e8db0a4af0382fe4083180b798d77bd37bfc355416f5402a061ca260bac494d0
font_02_sfnt_off0001131d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131D 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef