Malicious PDF — malware analysis report

Static analysis result for SHA-256 990aee978f0a8380…

MALICIOUS

PDF

96.1 KB Created: 2021-06-26 01:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5088e34632c56bded39a23c5ff8a8151 SHA-1: 14a84e62b77ba05e66ed36a40788c13dc6094b04 SHA-256: 990aee978f0a83803e92a5c307dd23f3dc6d6296864e0df8f07b8c4219862bc8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm patterns, indicating an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://garglob.ru/uplcv?utm_term=research+paper+on+great+expectations+pdf
    • http://abogarestudio.com/userfiles/file/44385821595.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085deaf483ab.pdf
    • http://axwelindia.com/uploads/53559348424.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160959bbed4cf0---29144565937.pdf
    • http://krevue.cz/UserFiles/File/76531298816.pdf
    • http://breakevenpoint.pl/uploads/editor/file/tazonuxuxuzivebeleko.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160af7ed2a54e5---lotoneteve.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4736d9174c---vapifawaxaf.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce97f76dc6---13460801713.pdf
    • http://frangarcia.eu/upload/file/78584457287.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fdaa1b40e---fuwifofemu.pdf
    • http://mysistermyfriendministries.org/clients/85776/File/32478973727.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b978f906e54---pugike.pdf
    • http://ahs1978hounds.com/clients/0/09/09313dc2b2b2138818c22350edca9cf7/File/23230082624.pdf
    • http://www.hgbehringer.de/img/files/files/puxugilexenuxizituju.pdf
    • http://camionespanamericana.com/userfiles/file/93031408339.pdf
    • https://imagebuzz.net/ckfinder/userfiles/files/56788704827.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2b41960c4---gajenokabogazofipepipig.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-6-20/20210620134426544341.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/d4dfad026a1d83441283e33432068637/xiveberozigavove.pdf
    • http://cn-junsheng.com/upload/file///202162652924837.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec609562e7---85112487588.pdf
    • https://euforbiabulgaria.com/uploads/pages/files/rerurutefi.pdf
    • 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_off0001161d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1161D 16792 bytes
font_01_sfnt_off00012e2f.bin
3984778ae54ce18c70772ee05546f14baa47800ae3016d1a36efac1afeffcfab
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2F 16800 bytes
font_02_sfnt_off000159e8.bin
bef3c22c18e95938b664081433e37c111e59303090d6768eb54e4243d9b6d6da
pdf-font-stream PDF embedded font (sfnt) at offset 0x159E8 11000 bytes