Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bb7e675d7ab6692…

MALICIOUS

PDF

83.4 KB Created: 2021-09-08 17:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3cb2c9eb19c7c76682837a51d28aafd2 SHA-1: fa52603c5fce61881cbe057ef159f671796809e4 SHA-256: 6bb7e675d7ab669231c0b9457775cc90f6f3b90c25f15d41fdc3dcff0392618f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and link farm patterns, indicating an attempt to redirect users to potentially harmful websites. The presence of embedded URLs and the structure of the PDF suggest it is designed to exploit users through deceptive links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://allytemp.ru/uplcv?utm_term=buku+burung+walet+pdf PDF link annotation
    • http://aodaiminhhanh.com/app/webroot/uploads/files/72470273306.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/98298644554.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/fusibujoruxazupolino.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/49277403508.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/71173018308.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/728f5a92b3f99088641496a69cfe7054/purakuroligol.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/70221108829.pdfIn PDF document text
    • https://enilubricantvn.hoakhanh.vn/uploads/image/files/lesevoxofilepedadizejigu.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138b04ad49e8---kanogafixoji.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/seterabebukekizo.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea5a965a07---xubufuwiwijojon.pdfIn PDF document text
    • http://irpuyesh.com/cache/fck_files/file/35028669363.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/626ce36c435911b9fa7638855a6b8e7d/87963045862.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346cc320851---xadunibavawa.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/89754508382.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/mizuke.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/1137431074.pdfIn PDF document text
    • https://pecintajp.com/contents/files/61174510808.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/dekufelasoxufeva.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/sunola.pdfIn PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/66030960451.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021090709560973499.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/niritewutudez.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_off0000e2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CF 17000 bytes
SHA-256: e9c5fdd87ee0e564e54e9b85239c935c3072739395b8439dec5e264182b3f29a
font_01_sfnt_off00010f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12768 10764 bytes
SHA-256: 46e70c4de94e081859aa0ff4ee333d2a9793ca5283913a1835529d3c4ee30b5b

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