Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef7190cb7f56667e…

MALICIOUS

PDF

90.5 KB Created: 2021-08-09 15:44:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1d6af86bf2a00606911fa94d3678ab3d SHA-1: 2e7e6d05f551c8b92943f826cf7c5545a1370be4 SHA-256: ef7190cb7f56667e0a30d0905cab72517b780404db692c99c81a33e7f927dbbb
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 Pdf.Phishing.Trojan and by an ML classifier as malicious. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on compromised websites or disposable domains. The presence of these links suggests an attempt to manipulate search engine rankings or to distribute further malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inlovehuahin.com/file_media/file_image/file/joroxi.pdf In PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/uf16765b8pka1hmsah8fjsoldk/76940072177.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/dibisadufepezinof.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/35127231197.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/4500ae6b8e4e6b59885c7722e556fd23/xaduvadolevonup.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/konudaxusovawewosepima.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/83356388492.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/9565583827.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/susikija.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/1191121351.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609041849efe4---xopekufarewukuxepavorote.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8bd52c2b3---jujufeditem.pdfIn PDF document text
    • http://moneymaker-gold.de/files/litiz.pdfIn PDF document text
    • https://all-new-wow.com/upload/files/fodakub.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/tasabuwururaz.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074531e57d19---36219801877.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9c5bb29e7---jarewusuzafud.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b485ee6ce6d---55403198295.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/766ad4d973351b4b2e5c3505a826a3dd/41799946751.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e17a88bf54---vewebujukirodivojuwesudib.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/xirajupupizemaz.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0a125d3e1---62181770901.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/nhmo14kds2sn9v1aekntq77umj/guvinenokarofubepuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=planner+5d+mod+apk+download+for+windows+10PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF06 18328 bytes
SHA-256: 17b1e06bf9e66b41b1525a2c6daf058938dcdfa2fb871be68a403fac3394e481
font_02_sfnt_off00011e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E59 11048 bytes
SHA-256: 225efcfc4b35f3f60cd53803b16448ad77f5467ea3b9e54aa802673ae0df0911
font_03_sfnt_off0001381c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1381C 17824 bytes
SHA-256: 518b00ba642beff020aa93dbfcca27962fccf8330ad765708fb89f4d337c2a02
font_04_sfnt_off00015376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15376 1700 bytes
SHA-256: 15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8

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