Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f8622fedb325ecc…

MALICIOUS

PDF

81.5 KB Created: 2021-09-07 19:04:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: ec3aaf3b9aee46ee7f93f28e0214966e SHA-1: 867762bc2e572eab3ec292e95d24d639cedf7a7e SHA-256: 5f8622fedb325eccd94617f9afb2d189602f9026b51b8f140895332fbcb48c99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://irlanc.ru/uplcv?utm_term=krups+coffee+maker+user+manual PDF link annotation
    • http://bacvietexpress.com/upload/userfiles/files/56853416487.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/pazod.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/wufugadomexebarew.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081b671f12ea---22244358988.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/wotidomakaxupe.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/jepowirofuronidefokosafu.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085fd32d08e1---kipewodulegewirifanonel.pdfIn PDF document text
    • http://yorktownhs1987.com/clients/57482/File/gozaba.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/b8294485382cdb1bc801f2867112bdff/20126279052.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/gabawamifawev.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8b565b38493b75b842438a580cec2c03/zozurafusabuf.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a869012236f9a02dcebb7f94683cfaa8/wenujuzosivaxap.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/6ab4qdf1su8c1ko2jfkjs8og0e/xelerafadupuj.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/dutisewepoparujin.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a74c1f07c---63885117823.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/zixiwu.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/e42fe8b3d9b74880a1d176de3d3cc218/25612169891.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name//files/jafufigulova.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/09d5acc3ca6a5c623ad69a92da01468c/82779337069.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/fuledajexelabenaweziker.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/3a12ad8c37428a11984773f2f222d9b0/gabamezasovopameju.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8E 10636 bytes
SHA-256: e922348c9ca11353b8b6afa4b9ecabf85145812e7537ac5186af94cba00e4252
font_01_sfnt_off0000f2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E3 17612 bytes
SHA-256: f94e663fa87074b419e47aec55c8c20873437d0148705ed32050f18444de790d
font_02_sfnt_off0001205f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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