Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a3bb8229be8b8a4…

MALICIOUS

PDF

76.4 KB Created: 2021-09-24 02:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d78a7d5d606f4261a5d55bfb803d618e SHA-1: 8f056d9d5ba1ade2d6b614b4b5371025f492c715 SHA-256: 8a3bb8229be8b8a4fcdb8a9a1b293afc4933df6d5830aa0430112439f02b6621
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm on potentially untrusted domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware via the linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=in+1973+the+united+states+government+passed+into+law PDF link annotation
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/ritufetexapebiwiwomol.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/68196220359.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/wisovusoli.pdfIn PDF document text
    • http://riviera.az/userfiles/file/roronedewug.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/85040749815.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/44886380391.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/xinubagatozet.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/sujabagebarujo.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/kazope.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropalaboralbarata.com/userfiles/file/sokilogodomi.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/3384522508.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/3324bdd89d08b6c5e205d1f19f153645/xiwufi.pdfIn PDF document text
    • http://cortabellanews.com/userimages/kedezogeba.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/gesinuwosom.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/46394382290.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16131f1d17b022---53240384053.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/161470e1d22db2---jelovivipu.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/rajepujugosojog.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/wiver.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/36465698278.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/27456967039.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/pofesutuzukobobefow.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_off0000c5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C8 16548 bytes
SHA-256: 1aba9c26b1f295d37100432d368a362022deba2976dd225cab56223659b6b4c3
font_01_sfnt_off0000f093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF093 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AA 11484 bytes
SHA-256: d9a632f1bf22d0f7d7233b8f1f922f717a7a1582f96ac8ee7d26659f3e1fa28b