Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae4c44f153caf72c…

MALICIOUS

PDF

80.0 KB Created: 2021-06-26 12:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d6bceb7498686005b98f93c6411e33a7 SHA-1: ea6cd95c714533c4704002d0fb11d088d3a7722a SHA-256: ae4c44f153caf72c987f03870c25136682798fc5c0505803510619673442ceb7
156 Risk Score

Malware Insights

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

The file is a PDF that exhibits characteristics of a link farm, with numerous URLs pointing to external sites, some of which are identified as compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further payloads. No scripts were extracted, but the structure and URL analysis suggest a malicious document intended to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16089923d22611---63032268779.pdf
    • http://mynigaoe.com/upload/file/20210514194602.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/9894d14e440ef88c325b0ab782f20459/masufusulanexes.pdf
    • https://cambodiaangkorhomestay.com/userfiles/file/susaniwiwutamimu.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/4hi898htre0qg0imujab8pqoq9/47955584701.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a42f410819c---sizikatunemuj.pdf
    • https://juvelyrikoscentras.lt/Files/file/57475732749.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b6777487de0---92142740894.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/491a7c4457f324cf33fe9c916e257532/62194147563.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607954d00158c---83237924051.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/a4728191cb026a42f39a22f9e0610fd1/lotev.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083234289d79---zivupikebikobibujul.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1608341842d4c6---89250015407.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/d4c4488045d7818ed7e505aae446c463/senezutorotononofuweke.pdf
    • http://cuacuontoanthang.com/media/file/55878071436.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/89oceta0k7lue238t9pti9ddgn/vajalazutariwuvupiled.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075145e40103---53048417191.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/2hehea8dr9eoak06ejo5i2ensr/vatamuripedirokanarexa.pdf
    • http://ytovietnam.net/ckfinder/userfiles/files/32348182016.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848e460d2f3---33880214235.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/17cu5cuctqhq6e5enfncbohjm0/xipilamisanifenuwo.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb45787bfe---29363916777.pdf
    • https://agrimal.pl/userfiles/file/sexen.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/376e59a88787cd835d80819afaec0eb3/newadajozopelobajapulifo.pdf
    • https://holocaustresearch.pl/nowy/photo/file/75685194530.pdf
    • http://gasthaus-steinkirchen.de/img/editor/file/vibelorobajilutu.pdf
    • https://directorvincentchow.com/fck_filemanager_upload/file/tevisegis.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/2c2152802efc6f09c3f615ba2e711714/57009213178.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=power+in+praise+merlin+carothers+pdf+download
    • 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_off0000d6b6.bin
34ff384187fa88a616caf143f851782314bb24d8be63643de5e8a575b4bf5df5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B6 16664 bytes
font_01_sfnt_off000101e6.bin
82acc3e5792d3ccfd0686785488dbd0d8b74a6174cdeccbc1860070a5ed3e52b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101E6 10972 bytes
font_02_sfnt_off00011b37.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B37 16792 bytes

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