Malicious PDF — malware analysis report

Static analysis result for SHA-256 aed33f3f2b84b66f…

MALICIOUS

PDF

77.5 KB Created: 2021-09-16 02:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8940266061b35b2d8db7823f668d14f3 SHA-1: 17818f426c4046c5c894104929c287b4c1bfce06 SHA-256: aed33f3f2b84b66f37680ec34036363a2b8a917ce9276a28d5093124326239aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be compromised CMS uploads or disposable hosting. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, along with the ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION firings, strongly indicates malicious intent. The primary goal appears to be directing users to download files from these compromised or disposable locations, likely serving as a lure for phishing or malware delivery.

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://pistant.ru/uplcv?utm_term=download+file+ppsspp+most+wanted PDF link annotation
    • https://bruceautoservice.com/files/file/96335866621.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/nusejitunezefonidege.pdfIn PDF document text
    • http://prosquash.by/data/rafemuripid.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/k8qmrch534efdbhpc64jba6ib6/67295310615.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613dce4d0278f---bifilo.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/68916347473.pdfIn PDF document text
    • http://kaitianjinghua.cn/admin/userfiles/file/202109151458396929.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/ragedex.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/watiriwekokeferun.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/61920999068.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/sekifuxuzokalurupazosepib.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/7205576290.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/88353635724.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/b33e5b25e9b7cf7452558918b37d56d2/15481753707.pdfIn PDF document text
    • https://ijp2.com/contents/files/15280967167.pdfIn PDF document text
    • http://tipiland.net/upload/file/bivibolobamulotexemuzimu.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/36339387103.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/b7a14b3399f412652a45572291421d82/magexoruro.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/75270938122.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/45798345910.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/22038277282.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/keselunokupisamojavalen.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/31135276553.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_off0000cc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE428 17288 bytes
SHA-256: 3d4a01fda82c344c288ec9c65d2c7ca0f0086c89abd9decc133740db249167c2
font_02_sfnt_off00011033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11033 10648 bytes
SHA-256: 7b0bdbd800a262a1267d78300d09f60b91a4c086edf87dc0f81a5bc7b854f11a

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