Malicious PDF — malware analysis report

Static analysis result for SHA-256 28622a4cfb177b18…

MALICIOUS

PDF

82.5 KB Created: 2021-09-12 19:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e25051e343eca03b3bcb2900d54ceb16 SHA-1: c6c955191a561f28cb9834e19c0f02a7038ccad9 SHA-256: 28622a4cfb177b18e46c42b0e5fff49871e04d6d9c064b2806b7b25975a2f293
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, aiming to redirect users. The primary goal appears to be user redirection to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://cleaner.pl/userfiles/file/furovusikunux.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613913a480af6---budeguwanasuxiwuranu.pdf
    • http://www.moyekolodin.com/files/79458167606.pdf
    • http://baraanduliaptti.org/userfiles/file/39972749174.pdf
    • http://zoncmswebsitebeheer.nl/files/editor/file/69053957842.pdf
    • http://winfielddeli.com/ckfinder/userfiles/files/worexakawube.pdf
    • http://ieltsadd.ir/cache/fck_files/file/37888139831.pdf
    • http://vitalchurchesinstitute.com/files/file/jeradeweber.pdf
    • https://lmcmanager.com/ckfinder/userfiles/files/xanidelizuzikuwoputadupi.pdf
    • http://dancephoto.ru/userfiles/files/28703547185.pdf
    • http://gemaeldeundobjekte.de/uploads/files/66944892186.pdf
    • http://phutungototuanphat.com/img-tvdl/files/gizoruwewubamujirobiwud.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7b5736eca---risisosanawukaji.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130461a05324---busizi.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/402df7bac4023bb45716ce24dcf015ce/vusatoxivajuwuko.pdf
    • http://lammensfilip.be/uploads/files/wijipikelu.pdf
    • http://elskup.pl/images/assets/file/28126808183.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bab170adbc---29584408373.pdf
    • https://svetplus.com/userfiles/files/40653889988.pdf
    • http://citra.cl/userfiles/file/7822799724.pdf
    • https://mayxaydungthienlong.com/uploads/files/files/7067953496.pdf
    • https://songod.vn/uploads/image/files/duwowifomiros.pdf
    • http://partnercable.com/files/sorepelododanebiluz.pdf
    • http://planbmedia.hu/files/16356060086.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=the+sandman+preludes+and+nocturnes+pdf
    • 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_off0000d9da.bin
fe0964bff95fe57c410b809d667d36a7871b9a2e1ebb7a04a16c5424574d99ff
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DA 10856 bytes
font_01_sfnt_off0000f2b6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B6 16792 bytes
font_02_sfnt_off00010ac8.bin
1aeefef0a49f4cba03642a2ef9f1248aa2db35b276b5030fcc1d292c56e4908d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC8 18932 bytes