Malicious PDF — malware analysis report

Static analysis result for SHA-256 5559a44a9ff5d121…

MALICIOUS

PDF

91.8 KB Created: 2021-09-09 00:33:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 30b0e5202927c99429b3ee6a0d376a20 SHA-1: 11daefd3f7e1d28463fd42c7eea07d69d731c875 SHA-256: 5559a44a9ff5d1216f3a8bfb27a1b8094aff7dade160a109997fd8301904ab95
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URLs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload via the embedded links. The presence of urgency and download button lures further supports a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

Heuristics 9

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/uplcv?utm_term=naval+craft+android PDF link annotation
    • http://besteva.com/upload/files/58902876208.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/senalalajunupisavalixun.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/ragulenenetezilazeweb.pdfIn PDF document text
    • http://coniperfumes.cl/js/ckfinder/userfiles/files/rijisojonazix.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/wovudidenonemot.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/43373940912.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133528c1ae41---32083430664.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/13119937870.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/tujebumomokorux.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131cddb748f6---71818872553.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/livikikobezuzod.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/bawikemanunefuriwitig.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/sezojigupelagop.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109011231005229.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/lawufuwe.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/17203479506.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/tovobixezepasisop.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133322a61b39---56214123605.pdfIn PDF document text
    • http://cga82.com/admin/File/larevipigabinugaxera.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe8f72b227---31185696581.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/72078344764.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109010952544189.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/gufib.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/19425603997.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/puvilizop.pdfIn PDF document text
    • https://alariel.be/userfiles/file/54552570419.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E3 10212 bytes
SHA-256: ff6c7a9998e82db126ba5ab303883c15e9450698484fefe58566b9e8bd14bf4d
font_01_sfnt_off000109ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FC 20076 bytes
SHA-256: 2a1d335407361c31808303a391fdb36bbfd200f16938dd1d15031c808281e3a7
font_03_sfnt_off000156d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156D7 1832 bytes
SHA-256: 27f121b8406ab353ecfa4792e7cd254459712f85b3f706db096ec8750ce683a9

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