Malicious PDF — malware analysis report

Static analysis result for SHA-256 d436850f13b52149…

MALICIOUS

PDF

88.6 KB Created: 2021-06-30 10:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 42bb523fce57867eb2c535d8731e152e SHA-1: 1a1cf2f32b2cd6ace87f74073304b6de41d66591 SHA-256: d436850f13b52149504ebe02309ad41983ab04649c93d3b3739e6a6980cd45cd
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to lure users to malicious content or phishing pages. No scripts were extracted, but the structure and URL distribution strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/4b58d7286b001e04aeb87bf1c64266d5/89373554419.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/d08keprkmc2o4ifmksgtf02pau/10904480876.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ff9741505---12001762434.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/0766892dc4d7e09d5303ae8f8792ba18/sebenar.pdf
    • http://kaies.cn/upfiles/file/944118547.pdf
    • https://trotusgrup.ro/ckfinder/userfiles/files/bipedepotera.pdf
    • http://inter-travel.hu/_user/file/rigotuwevusu.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/fe1f0cb4e0d5a7671a5d2995fa5b9c04/62990622248.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d61bb42761---zudurolebid.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/11ff2e89901030e04f316f6b6c68d2a5/77853421004.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c211507313---25474469339.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/8it5cb7o8726dsbscdj7ii559r/fepapiduz.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bd7addef6---tokevosumup.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace96913321---34078665090.pdf
    • https://consultingexpert.eu/fckeditor/userfiles/file/pebarosopowidomati.pdf
    • http://abc-tel.ru/data/File/91175502762.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/6hfoelf8rfvmig1oo84ttud5ga/wilanutepetariwow.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/3878f95e2ce3de1c1a5d1ce33b929441/beridovivibumusijov.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/4811fe08838346e5558f1d69d7c4b568/muzufuzozolemubimak.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5643de01bc---5597891260.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3c3d9b6ff6---57876432465.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16098b3c62a987---bivedosepurotaboxa.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/b59c8ac66c1983d2e60af6667d9766e0/21463561545.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/7btv51dd1a4r8ksoasn24fplv6/11049937447.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=convert+image+to+scan+copy
    • 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_off0000f7a2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A2 16792 bytes
font_01_sfnt_off00010fb9.bin
84e40b44dc464014472470270032145ed4f6954ce230927ebf9cebbc9ed9feff
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB9 10880 bytes
font_02_sfnt_off000128f6.bin
ffc8533c6881e98b750aa3504b70eba10067aa52b43a0fd5bc392447c2e8fe6d
pdf-font-stream PDF embedded font (sfnt) at offset 0x128F6 17040 bytes