Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff9751e6b85da8ba…

MALICIOUS

PDF

86.7 KB Created: 2021-08-06 19:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc81b89b2266ce215e026639f56e04a8 SHA-1: 27fdd9d764ce40e967f3e3d225c865878699b608 SHA-256: ff9751e6b85da8ba75d686583f5d95f80b0cdcd1ea60f1b11f9472ff79cb9359
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the presence of multiple external links indicates a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://sindonis.com/userfiles/file/zezapoma.pdf
    • https://relans-nn.ru/images/docs/file/11535249230.pdf
    • https://www.adom.biz.pl/ckfinder/userfiles/files/bavipobinimiduma.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/8rtn54oatlt056hu66kgr7k638/70999275923.pdf
    • https://albawadiroad.com/userfiles/files/godurirug.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/ac791b930b9ec94d083f826102c75783/fuzasaluso.pdf
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/29074570394.pdf
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/jaxetumolesozedinabu.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160dcadf83861c---89756394447.pdf
    • http://al-bandak.com/userfiles/file/50528873662.pdf
    • https://ludifrance.fr/userfiles/file/guwafekegimakos.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608850d67b0b7---74023320206.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a11d79b6f9---31297010595.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6773940989---12885531722.pdf
    • http://sintellect.ru/Repository/file/66420036892.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609be20beeb67---63135553392.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086344e3268a---26603862938.pdf
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/tusixibopak.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/c8a852bc31b648845c73d0192c62eeac/bixunaxipob.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=quais+estados+%C3%A9+feriado+hoje
    • 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_off0000ea22.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA22 16792 bytes
font_01_sfnt_off00010234.bin
b252c73dfe0b7b1917933a40260721ffa26a1efd8ae8249cd31e0feeefd77428
pdf-font-stream PDF embedded font (sfnt) at offset 0x10234 19516 bytes
font_02_sfnt_off000132ac.bin
5ac17262a5f363d2385423f5c7606bcd7ce5f9f56ca9a02c032aefd99afbc8c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x132AC 10744 bytes