Malicious PDF — malware analysis report

Static analysis result for SHA-256 4442dfcc01a4fa7a…

MALICIOUS

PDF

72.0 KB Created: 2021-09-16 21:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 318fdc9ce296f98ab8ef00946aa075b9 SHA-1: ebe23c374e774092e0642073b55958a26dd6b95d SHA-256: 4442dfcc01a4fa7add46b609b205f7f6eacc2f8fe5de6d047f2dc7cdb43db38b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the heuristic findings and URL analysis point to a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9894

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 http://studioprogettoarchitettura.eu/userfiles/files/vazesebidorasekudov.pdf
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/potele.pdf
    • http://internet-trade.eu/UserFiles/file/nobozogovofuvosen.pdf
    • https://www.mnogotrop.com/ckfinder/userfiles/files/disipekasabulonowovod.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b46200c5ab---pujufabuzamiguxawolara.pdf
    • http://sdsenlex.com/upload/files/94880510219.pdf
    • https://daaeportrett.no/upload/file/15003437216.pdf
    • http://jmyhship.com/uploadfile/files/getuletenime.pdf
    • http://foto-preiss.at/upload_files/files/75339380829.pdf
    • http://chpcentre.com/files/file/guvesupadodinebus.pdf
    • http://jatechkj.pl/upload/fck/file/rogetunojomilizizo.pdf
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/32723866326.pdf
    • http://syuncyoku.jp/upload/file/65635955225.pdf
    • http://as-eng.biz/userfiles/file/nonanifez.pdf
    • https://jamisonfurnace.ca/userfiles/files/nulogevobenipomaduviva.pdf
    • http://aokunoil.com/ckfinder/userfiles/files/39772097208.pdf
    • http://nerezove-kuchyne.cz/UserFiles/File/terofedasikotevujej.pdf
    • http://missteenqueenuk.com/userfiles/file/xuropize.pdf
    • http://wwm-quanta.com/upload/files/49667197209.pdf
    • https://rugsdirect4u.com/uploadedfiles/file/kujatujevoris.pdf
    • https://minhgianggroup.vn/upload/files/15128772282.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/e58a7d6ca7292d4d16b5b3260df87912/58706523628.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393a7ea61dd---niwofipazigerafipudakuxo.pdf
    • https://trieurodata.ro/images/file/xidipafuwimipetomiladem.pdf
    • http://gillsandgeckos.com/userfiles/file/47886454473.pdf
    • http://yugang360.com/upload_fck/file/2021-9-15/20210915174820657653.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161318dea9ed74---24758223424.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=rise+of+nations+apk
    • 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_off0000bab3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB3 16792 bytes
font_01_sfnt_off0000d2c5.bin
df80412f4a2decaebc187a9eb04a527cc72d990cadc26bf766085c54926103cd
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C5 15736 bytes
font_02_sfnt_off0000fae0.bin
991018b4fec939b1206542b47fb8f56be1ddb4dd5b8c49ae60dcba29fa93a50f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE0 10340 bytes