Malicious PDF — malware analysis report

Static analysis result for SHA-256 7033023e3e134b38…

MALICIOUS

PDF

74.2 KB Created: 2021-09-13 00:19:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b01fff1c0ab9a046c79f16ba053a310f SHA-1: 2701679e7326f6e3e81d83b53b1d314cc56c6897 SHA-256: 7033023e3e134b38d7a9ae5058f49474a6ec61e10d08ac93cff94c3537ffc241
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with multiple URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://phuquytravel.com/nguyenvanlinh/files/fezuwivugofi.pdf In PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/polozojomafalekinuf.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/42338146090.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/wukipadomokelaxuvogigebu.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/f600fd096cb202965a51f976e0b3803f/7242161385.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109110412293495.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/modukipalomaxemibudala.pdfIn PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/bazojuzosemo.pdfIn PDF document text
    • https://euchebnici.com/img/file/18580213841.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/30413904316.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16136a639c340d---44854834834.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/1581ad322ef2d26f7dc499333ac7a0af/37229154080.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/161356ef91c872---gidanuvogitubudeb.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/2790eb3cbbaf9f9af97076e61d8424e1/42938931463.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/d4f2f48350c87c637b9e26a43a652641/jabitimodat.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210911022018.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021090610005111.pdfIn PDF document text
    • http://apple888.vn/luutru/files/19393391231.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/29190345498.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/e790196fdbc63ac528beca94e7fcda3c/tarekujedesonades.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0a207d01a---mixutotogo.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/77292756329.pdfIn PDF document text
    • http://ewtch.com/upload/files/76700141855.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/bivefebosekan.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/14630683183.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=racing+games+pc+free+download+windows+7PDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF1E 16508 bytes
SHA-256: 24235d4fd718be2fff18e30905ef373b9602162d37add7bc5f0b9ff688692bbf
font_01_sfnt_off0000e98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98F 11044 bytes
SHA-256: daf556a1ffa1d4f54956f433fa3f66836fa0d430a132fec1250662bfa891f588
font_02_sfnt_off00010321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10321 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1