Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbac41ec25e26473…

MALICIOUS

PDF

84.0 KB Created: 2021-09-11 22:25:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e09c4180f482e77f63045189ec1f18ec SHA-1: 6353ed067cd5993c58a080654f0eb68ce3e51ae9 SHA-256: dbac41ec25e26473c0b80eafcea678160546df6d0f98935b882ba59b7f02afb4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics indicate the document's primary purpose is to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://tresonance.org/uploadfiles/buxetutuvibigakonufawat.pdf In PDF document text
    • https://ijpdua.com/contents/files/96023461080.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/bokusexudutamizukaxojivo.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/17201015681.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/pelibututuso.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/vukubugusurojerifuvi.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ccb0870b5---xevaguwukepijaruzak.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/kokunijufuxurifitenape.pdfIn PDF document text
    • http://jedwines.com/cmsCart/upload/file/26004223384.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/68354175287.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/42766986660.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/38049818072.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/80298418882.pdfIn PDF document text
    • http://ustunongel.com/image/files/69070991915.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/79299313212.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/3c226e1ea5ecb6ce9cbc13e4e786d496/latusepu.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2c1590fe6---jesusowufepimisafodesaju.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/34557689380.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/0b215af81832925a4862c79ca211a8c0/mibonejekurasetimo.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/tanowoveneso.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/mupefa.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/46641492291.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/kegoxos.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/32462776209.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/xetefaditevisufasumozexi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=insta+hack+mePDF link annotation
    • 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_off0000e2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F6 10180 bytes
SHA-256: 3410e639e734496eaa07af08ba2fc5122aaf7d5ca0d97fee4c449de73e7c242d
font_01_sfnt_off0000f995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF995 19276 bytes
SHA-256: ce33662069676ff66771ecab5d3a41cdbb4d530fef58983350ee8d2949fcdec5
font_02_sfnt_off00012a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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