Malicious PDF — malware analysis report

Static analysis result for SHA-256 b50889b9c192bc16…

MALICIOUS

PDF

77.9 KB Created: 2021-08-22 10:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f2a74170a41e6e7e4d39450ba099ebe5 SHA-1: ed684f12694af27eb0185ed76160a3d3ea38d6bc SHA-256: b50889b9c192bc16d76759f6f7c06d35734097ebbf77fa978d6a5b6c8686a95a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting. The embedded URLs suggest the document's purpose is to redirect users to these potentially malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/1fe4874deca84042e9a539b689ec652a/buvexupesakowajidofabu.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f95a6eb784---rejedisalidanoz.pdf
    • http://haenuri.net/ckupload/files/lekejerovaxul.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb48338760a---rixidisenojokuz.pdf
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/97176986569.pdf
    • https://daismene.it/file/padez.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccc07a891db---burokixativiletiralapitak.pdf
    • http://cga82.com/admin/File/40321835314.pdf
    • https://sayurhijau.com/contents//files/20276821671.pdf
    • http://ackerviewguesthouse.com/userfiles/file/29360892194.pdf
    • http://vksraja.in/fckeditor/upload/file/48617825487.pdf
    • http://aihyang.com/userfiles/file/41753692138.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/8aujb08e0a4683km69bhghlkv0/jewenuv.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080eb881b2b8---11426451374.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee4c3839f33---roderib.pdf
    • https://client-sms.com/ckfinder/userfiles/files/bitasisisanuli.pdf
    • https://rabudiagnostic.com/userfiles/files/dunafutesapekoji.pdf
    • https://polistirendecor.ro/app/webroot/files/userfiles/files/42673528407.pdf
    • http://haumeaonline.com/userfiles/file/fipiwixadofefugezufural.pdf
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/kopusoragakisodug.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/206a2dc51ba95d60bf8b94244262509d/64388558791.pdf
    • https://bookatowncar.com/userfiles/file/34288333299.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=kmspico+microsoft+office+2016+product+key
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccf9.bin
60e7b409a5f98fe90497edc875c57cc97a7c2085cb8e57734a5e880af1755093
pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF9 11228 bytes
font_01_sfnt_off0000e76c.bin
06d8eb991bff732c19b5e17238dc33326bab77c749b7eb12bf56c76249871ec7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE76C 16420 bytes
font_02_sfnt_off000111ef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x111EF 16792 bytes