Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d733152ebd03311…

MALICIOUS

PDF

84.4 KB Created: 2021-09-19 02:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 88fc96f7a47bf160e3f8ae035c9b532d SHA-1: 368d4b4c3e20ae00919df3c05b34b562d888f36a SHA-256: 5d733152ebd033111b4139dd4b86175e025fb47a852f34d348bc7e8e36c39200
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farms points towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://medvor.ru/uplcv?utm_term=korblox+deathspeaker+promo+code PDF link annotation
    • https://mkart.it/uploads/file/29405522626.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/3022662340.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/7931554934.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/77330725199.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/vunegaxefefuf.pdfIn PDF document text
    • https://avela.md/userfiles/file/30336638817.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/99285741181.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/pozuxikadupaluv.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/56079494302.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/95078420116.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/teruviniw.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/30759451891.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24713701145.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/9190476832.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210914_20D83DBD441A0051.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/bubozo.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/5672395964.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a666dcb669---wolufidipurofoze.pdfIn PDF document text
    • http://cobmedia.hu/include/83571118675.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16132e661703e3---85670961544.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210908082034.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0140e2d02---naxulavitofigo.pdfIn PDF document text
    • http://agavietnam.com/img/files/87963139437.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210909191942.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/zexemenugitiwavitubibuvum.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_off0000e035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE035 10908 bytes
SHA-256: 91a7f7b824dd862c725565b66cd9def4082a6c9446ccdafed9292598c913322e
font_01_sfnt_off0000f94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94D 19392 bytes
SHA-256: 3e49b337fe894adb32f8e0d0fc0f8e76ddcd2d839749754196e34d3e03846e66
font_02_sfnt_off00012b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1