Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d076d45e8b3162f…

MALICIOUS

PDF

75.2 KB Created: 2021-09-16 08:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e16486c8ff3ef8269a149f47c245c78c SHA-1: 3799eda5f8030ab49db8b1e54dda1a2b72b6973b SHA-256: 2d076d45e8b3162f6be223cf188eebde631fbf6968e0cda11042ec292bbb8deb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm or phishing operation. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the structure and embedded URLs strongly suggest a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://drafthe.ru/uplcv?utm_term=where+to+find+deleted+videos+in+android PDF link annotation
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/xulapuf.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffa24bdcf2---kesoxapowefema.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210916071134.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/tasajav.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/e5ea31c2ff83b2e90fffb0da318361ba/76402689804.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/moxubuzumigogosejedute.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/ledatuz.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/89236913729.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/85536860671.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/10353542659.pdfIn PDF document text
    • http://parfumland.sk/upl/wafap.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/jupezoganuvuwumemofowi.pdfIn PDF document text
    • http://www.culturehousesun.org/photos/file/pagemawedan.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/vosigojuxixevulanasedene.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/5773557495.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/12949209576.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/puporasaradejanaxurolona.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/48585964657.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135baef03caa---25169550488.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b63811a599d50f1e7e8d31978ebbb62b/fofevumu.pdfIn PDF document text
    • http://skalamatbaa.com/userfiles/file/12392803730.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/xarajug.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/31867420308.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_off0000c343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC343 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5A 10512 bytes
SHA-256: 56cebbf501d0a838c5ab5d409cce3c858fa99585849ef534d3b09b59131a7e59
font_02_sfnt_off0000f341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF341 16940 bytes
SHA-256: 7cb84400437be5032ef4cb9c583c0df0243982093b8fe559a3cf6a1eafdcd471

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