Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab8fe37388c373f0…

MALICIOUS

PDF

84.4 KB Created: 2021-09-23 03:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bef2bf437b25e36e855fe2440315043d SHA-1: 819fb087c829af6ca648091f159c95f4f0d3134c SHA-256: ab8fe37388c373f091cde55415ec1d2eca355db6c1e7a2437c8bfa53de9bb01e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting, suggesting a link farm or phishing lure. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is a common method for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=moto+x4+latest+android+version PDF link annotation
    • http://cn-polylysine.com/d/files/zapolixudewedomibigozi.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/79706213647.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/karufanefifu.pdfIn PDF document text
    • http://homeopathyhk.com/files/mezifuw.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/98011487326.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/29011221515.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/40643934091.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336bb288b4b---50338768823.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/defegebitubi.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa5f0c045f---mumuzajekomejarivowag.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407a0b375f8---dujizazakowofupabekadevi.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1630778858napepuxetutotox.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/zawosajuk.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/90729432946.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/15743504481.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/a7f88ebc3b0f6946d5541bf2fec7c818/modifufewexi.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/megexanapizunisos.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/woxanirosuwidefa.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/95992074605.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/zulutaz.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/57636300520.pdfIn PDF document text
    • https://latarnik-kopice.pl/galeria/file/tuvulilujokigusiditeziw.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/jarefotixe.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/31152020000.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_off0000e138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE138 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94F 10480 bytes
SHA-256: c32d53fd3176598647a0fe30a16d1b637f06f39357fde00fb60cc2515b36e806
font_02_sfnt_off00011152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11152 19228 bytes
SHA-256: 91defa28d6b261d7f455509caacf8e61fff0dee31e57d7cd2cd14f69ddcbe1d2

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