Malicious PDF — malware analysis report

Static analysis result for SHA-256 2adbab20bedb1080…

MALICIOUS

PDF

85.2 KB Created: 2021-07-21 09:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6ec6edfd10322277dedba488d2ade5c7 SHA-1: 4995d646e51dfa30b3abe28b37e607c3e7e0605b SHA-256: 2adbab20bedb10802ec3fd80fb52aff3c3e6e10d2032a73fc550a35828472fb8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised WordPress sites, identified by heuristics like PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs suggest a redirection mechanism to a malicious payload or phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://thaihotelsale.com/FileData/ckfinder/files/20210624_B46AFF43B4696F5E.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c38177109e4---49876394654.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/ll9ug5lubbakv6p0vbdv2p5spo/botamipepowezaf.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/o7lg3succun9ut96clm2sm1hv5/26921584102.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af63cccc27b---92330238717.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/h3qvt418rjpago5f8beagfsb86/33082023986.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1607e327554f68---dikuzoronir.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/87deedef7391f3f0cd6b84a388337b6c/sovorijawedevedabe.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608138501dcbe---11730012949.pdf
    • https://yomadesign.com/userfiles/Proj_Name//files/fetewurazufomitepopif.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca22f73111---pajajobe.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160e618e67a043---nipotofezugepifuvofasuva.pdf
    • http://plastikacz.cz/soubory/files/76074812103.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea30d39c4e---74568300825.pdf
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/berurabixilotuv.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608db6e221e58---xobuwujamepodiko.pdf
    • http://abwlargo.com/uploads/files/87613344021.pdf
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/fcc7387b18d0a9642da1e02c27e353a6/lesokupavi.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/222jg3pg2glvq64ucqm9mbg0t2/2253953952.pdf
    • http://aire-limpio.com/img/editor/file/19433986518.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd39a3d563---92464116440.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/mn24s80v4ko10ro75t4me812mo/zemubavaweso.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+convert+pdf+to+ppt+in+windows+7
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811dacc5efa---kisefomifalusazasidid.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_off0000ec34.bin
5b57570af6bac03f38df0f5a2cf067dbd98ab64557aaf5e8324a3c79c15e07af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC34 10596 bytes
font_01_sfnt_off00010497.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10497 16792 bytes
font_02_sfnt_off00011ca9.bin
c015bd3a6882b9e9651b6d5a925a60d8eebc415add352a071b7bedca79b86038		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA9 16532 bytes

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