Malicious PDF — malware analysis report

Static analysis result for SHA-256 05ac3488e384e18a…

MALICIOUS

PDF

101.6 KB Created: 2021-08-17 08:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f49cfb26cb81d7988d45cff00c14eb0 SHA-1: 2bee6a8518ff6acb2a1b20e801cc80027905daad SHA-256: 05ac3488e384e18ac4bb02d872b29e260602e39f407b74cac06ccc7eddcb2bad
154 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm or phishing lure. The document body is heavily obfuscated and unreadable, preventing further analysis of its specific content or intent beyond the observed link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6755

Heuristics 5

  • 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
  • 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://bostoncake888.com/UserFiles/files/kugibiwixapaxuzubuwag.pdf
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/6677776213.pdf
    • http://grafichesirio.com/userfiles/files/zuvujowode.pdf
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wagadu.pdf
    • http://www.gabrielamaciel.net/images/content/file/logeso.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bde15150cca---81938677335.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/dp0n4r68l57vpp6q8ajg12bpk7/namuli.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e058887e44---dabonufezaxedufojebiz.pdf
    • https://allcreaturesinc.com/files/files/jopodabasirexewavasilije.pdf
    • http://absigorta.com/E/file/garibipovunekagi.pdf
    • https://editionsitaliques.com/userfiles/file/loxuz.pdf
    • http://sjhrz.com/images/upload/File/zutizeloladoxaxaxuvexig.pdf
    • https://bodegoncriollo.com/userfiles/file/28143295275.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/6a8a31078e7b55388ff0e8efc5c62377/8501407998.pdf
    • http://moonlightmontessori.com/upload/files/dodusiwu.pdf
    • http://vagtteam.dk/userfiles/Files/5843432138.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607552670efae---zofurotosisejotif.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f1b2e1809f8---32271448677.pdf
    • http://fujavietnam.com/images/Download/sukonekupasixew.pdf
    • http://mamnonlittlesun.com/upload/files/vunewavijajiwoba.pdf
    • http://habitat3.eu/userfiles/files/58765199368.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/92c39a592b4976457869b05cf0b8741e/15958617887.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+do+you+cite+textual+evidence
    • 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_off000136fd.bin
c0a2336b9ef28bb9953f36cebe0d54ef5e8246ad7accf127d916b916021fcdd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x136FD 10552 bytes
font_01_sfnt_off00014f2b.bin
7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F2B 16312 bytes
font_02_sfnt_off00016532.bin
dc890387d284c701d9d38e2c5f118b8fae0b384deeceeeb66736bd44c22d8c73
pdf-font-stream PDF embedded font (sfnt) at offset 0x16532 20180 bytes