Malicious PDF — malware analysis report

Static analysis result for SHA-256 05a66f8191cf2a86…

MALICIOUS

PDF

88.4 KB Created: 2021-07-18 02:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: db75d05ed753e294e11033b2542bde9e SHA-1: f90b600584d7e6a85dd15d73e3f3be4e96ab64c1 SHA-256: 05a66f8191cf2a8682b28f2e00f448e8820e99e54c135ecd083454d1a1bfd584
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards an attempt to lure users to malicious sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/qt4bjht7v1nbulki3ta99embaf/98793054582.pdf
    • https://cncunse.com/d/files/72142937334.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/2cf67f2ee817e9a21dba36f6554af112/lutijafazi.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16093280022961---jefakam.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a43ef693e58---mobofasukanux.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/p6cceq01mqdjrv67dhqti42q4k/17087767912.pdf
    • http://carlaschroyen.com/content_docs/12573669828.pdf
    • https://nadamasristorante.it/file/75746775549.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/8967ea423c3a0d0299afbf68f6dd5fe9/najinamaboxowidukuxire.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608799e813f87---zulotuxon.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f048e8858---71086716917.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb5f6691080---nebigodagularetuxuboxam.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/d95eddd41504eee5a3f3cf343b9bd7c6/nexijuzidile.pdf
    • https://paklya.su/design/img/upload/file/78271647843.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/3fe36aa638e219349efe486c2b8f7021/33286332410.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607554b759035---wetet.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607839e751fd3---fijalisageputagesetelize.pdf
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/38874730657.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/54dbe15f5065fda21d26b80378a1f906/benuvigimag.pdf
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/96002042690.pdf
    • http://www.truca-taoules.com//ckfinder/userfiles/files/julolifet.pdf
    • http://carsongrad75.com/clients/3/35/35717660c32d3dd9b0ffde8f33a19d23/File/woxosetara.pdf
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/zekadawa.pdf
    • http://dietetyka-24.pl/images/files/kumebi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=excessive+dryness+of+skin+is+called
    • 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_off0000f614.bin
f5d8fbe0626b8fa93483e8d2954162e47d23c47a48693107ff14e8d7e3a95fae
pdf-font-stream PDF embedded font (sfnt) at offset 0xF614 10728 bytes
font_01_sfnt_off00010ee7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE7 16792 bytes
font_02_sfnt_off000126f9.bin
8d4e3e5e6cd80e0539bec9042f865462cfc351b313781e30a19d34f827d4b5db
pdf-font-stream PDF embedded font (sfnt) at offset 0x126F9 17300 bytes