Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ad86601ccadbaa8…

MALICIOUS

PDF

77.6 KB Created: 2021-09-01 08:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 14004b98c7f13ad2c861016c6ce8c85b SHA-1: 7155625275b60dbd1158403d9f01050b9511326b SHA-256: 2ad86601ccadbaa89c3bdd915c20a8e13a0e8094edbedb33b57c087c33cb38bb
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress upload directories and disposable hosting. The primary purpose appears to be redirecting users to external sites, which could be used for phishing, malware distribution, or SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://full-flavors.com/img/Data/file/5496020296.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609018de24ced---sizudalovev.pdf
    • http://lesmashclub.com/imgUpload/files/vimukofexototilejuver.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/dadiwutozamopokevarokiri.pdf
    • http://svazekobciorlice.cz/userfiles/file/77021680175.pdf
    • http://superplasticizer.cn/d/files/29293320491.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ae95a0e2539---telitivasofalezilopeburaw.pdf
    • http://allmedicus.com/userfiles/file/xakiputenam.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160771845ea61e---82031636422.pdf
    • https://asfus.net/virgsurv/userfiles/file/21706522941.pdf
    • https://kopari.hu/files/file/98362555730.pdf
    • http://skiflogistics.ru/userfiles/file/kadojonow.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085827109685---bugujeziwa.pdf
    • https://taptigrihnirman.com/singhania/downloads/file/mazoretisatujitadenobilat.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8ce79b8fc---1574922350.pdf
    • http://litho-and-co.fr/ckeditor/upload/files/budoxurinofixifokatok.pdf
    • http://alexhofford.com/temp/files/file/86390191036.pdf
    • http://nedirajtebosnu.net/userfiles/file/sorerukegixajurim.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c805ab28ca---palorim.pdf
    • https://sgotomotiv.org/upload/files/wifiwe.pdf
    • http://isgsrl.it/images/file/tijuw.pdf
    • http://thetuckerfamilyreunion.com/clients/67950/File/zosotawedidamepawolipi.pdf
    • http://kipia-nn.ru/userfiles/file/88991695436.pdf
    • http://meble-tk.pl/userfiles/file/difizexukiwotupib.pdf
    • http://gorisum.net/fckeditor/upload_file/file/kawepakijonotodoxij.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161216c1330cbe---35398482972.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=pineal+gland+development+in+embryo
    • 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_off0000cb8e.bin
03a703e9ce41cea6ee973e017e0d4133ad9727075e3c9ed731ca477bef7a3cc4
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8E 10888 bytes
font_01_sfnt_off0000e442.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE442 16792 bytes
font_02_sfnt_off0000fc54.bin
f0d5eda8ac8ebfdab7ab6aa9310af57e487efe24ec6a3a9860111f74d602bda5
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC54 17196 bytes