Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bb108100ee633b8…

MALICIOUS

PDF

80.3 KB Created: 2021-09-16 01:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: c8c78889681cfaa08c967848d0d56174 SHA-1: 5fdba037ebca85d036d571ca032a0b33c36aab27 SHA-256: 2bb108100ee633b8b16be343a58e4c1018394fa1b7f8cef24d537308fb75eb2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the PDF structure itself point towards an attempt to exploit users by directing them to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://pixomot.ru/uplcv?utm_term=flix+player+apk PDF link annotation
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/i1lesc664okj3nqqiafuk6p0v4/dozowifukufevuzusez.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/bawevunusozegetezivat.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/81199757387.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b3178051b---sopezer.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/jasebejopelap.pdfIn PDF document text
    • http://pinxedien.net/upload/files/woxaleluraxawesu.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/38804867782.pdfIn PDF document text
    • https://promoxcenter.ro/ckfinder/userfiles/files/79676371731.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/68916347473.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/fapebamavepexopuj.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/93627247439.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/40934232345.pdfIn PDF document text
    • http://millenium.moscowfashion.net/content/xuploadimages/file/60129740150.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/35430272065.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/zabobotoxuvapag.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/sasil.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/xasapivinefabanagizuvaza.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/66957391136.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-09-03-12-37-17-Qx36q7Yt.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/49027995096.pdfIn PDF document text
    • https://tranhdaquyhn.com/uploads/news_file/41923171029.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/zoluvev.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/40704631002.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/mozopokafexuwes.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/26756244397.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca8ce44e46---vexurajewox.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_off0000d4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B1 10040 bytes
SHA-256: 6cba0700c9b00e704100cdf6d1682a04594c049fba1a957963059fa99d1cac12
font_01_sfnt_off0000eb14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB14 18564 bytes
SHA-256: ce3eec422e006655bf4d8397349a675f2c3ad8315335d92160f83bdbdd5473fc
font_02_sfnt_off00011c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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