Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8af46ea53d8c712…

MALICIOUS

PDF

86.0 KB Created: 2021-09-10 18:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9f817ca9d58b75e8fa5ddcc8b52b4b1f SHA-1: 907bc8049a265d9aa4ad2e850068335aaa972ea9 SHA-256: e8af46ea53d8c712c0a77da2e07d9e847effa8ef1ba9e5f626bc0bd8bcceb3a1
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm for phishing or malware distribution. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection strongly indicate malicious intent. The embedded URLs and the nature of the heuristics point towards a phishing or malware delivery scheme disguised as a file manager download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=file+manager+android+apk PDF link annotation
    • http://calisnt.com/uploads/files/9525969831.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/vu018h6ktbuvctechrb5imni95/mijuloxepamokagetimafisin.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16135f9bcea5e4---runifegusem.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/notutokukimanijutej.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/79194364868.pdfIn PDF document text
    • http://bscartridge.com/pic/vizudabepoxanebe.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/rolijodetitafaxumev.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/73562203650.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210910072434.pdfIn PDF document text
    • http://esipro.be/userfiles/file/79141668702.pdfIn PDF document text
    • http://krzeptowski.pl/file/92971392129.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/dasarunafile.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/51117518504.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613595e28bb4e---50417676566.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/kosasopumojejabewuvux.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/demukimunojujopumono.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8847e2363---23202516430.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/84976398056.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/44214654236.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/50117956324.pdfIn PDF document text
    • http://accronline.com/userfiles/file/pizosatutuxanedovobuxi.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/vidujezev.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/40200731166.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_off0000eb50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB50 18392 bytes
SHA-256: 7836740fce029d62d695e92a60f251a356719fedb8da6b7d5736edf296d76b80
font_01_sfnt_off00011aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E1 10536 bytes
SHA-256: 56257d7c47572c6c92d608b9834543767007c6eec5386e9370186af9ba50258a