Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbbc2bbf4b079dfa…

MALICIOUS

PDF

80.9 KB Created: 2021-09-19 18:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2d3ee67441cef2b655f7ef9dfde6ae4c SHA-1: 92f9501560423a3f6e05e9415a7618748628b1bc SHA-256: bbbc2bbf4b079dfa2cada175c67d04b03fee36dd9562b692f50e35f479a4a442
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The presence of multiple compromised CMS upload links suggests an attempt to host malicious content on seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://drafthe.ru/uplcv?utm_term=magic+the+gathering+mod+apk PDF link annotation
    • http://airsoft1.ro/files/file/jedopokilorekipawuwax.pdfIn PDF document text
    • http://aven.su/userfiles/file/noxidinapavexemexuzu.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f93e6ddf00---95518172553.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/vedawitamirux.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/ninotugijute.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/wejara.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/2286819327.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/4876292897.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/bujukemirumav.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/wowadapomejiwagepe.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/sewojaranumu.pdfIn PDF document text
    • http://cross-winds.in/upload/contents/images/images/varidetigetetavufawo.pdfIn PDF document text
    • http://ityab.com/cache/fck_files/file/22929153439.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/lfl0slkdbogr29grbku56vmv1s/mefob.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/sipenunusipemesavekiwaju.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/dojofevu.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/22700757476.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/pekazud.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/43232748841.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/74b2627a2565caa5bb903a1a836c4146/mudasawiridajolemub.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/68799403363.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/moxinigulogefapunode.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/1e6d34778be1066b8fc5c244776d79db/95062047447.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/82833664492.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/xipewabikopirej.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210909185922823.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_off0000d5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A8 18076 bytes
SHA-256: 419ed2cac8886a642b2a0b949b329601f790ee85a5845f9a89dd78fad77aefd5
font_01_sfnt_off000104b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCD 10832 bytes
SHA-256: f22194b0e503a5465aab9af78db46204db780350b09bd77e10394bd31e3bf003