Malicious PDF — malware analysis report

Static analysis result for SHA-256 aec85dbb6dd5913b…

MALICIOUS

PDF

70.2 KB Created: 2021-09-30 14:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: aba354b31382dc98ff21059d97d5c2f7 SHA-1: 8e0c7e7bb71185e1cee07c26760a77ca2b5deda8 SHA-256: aec85dbb6dd5913b7a401e4218b44ef24e7121447b64e25dcf1e13392549a35b
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of multiple suspicious URLs suggests an attempt to direct users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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://www.aledrukujemy.pl/ckfinder/userfiles/files/92950938628.pdf In PDF document text
    • http://fixafilm.se/userfiles/file/85834240734.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/24218221625.pdfIn PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/nufuvolisitowimuwolemupan.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/xibosipanogonimekutenukil.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/47vrdkvrat92ji45bmhfrm9req/58510927194.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/rilixuzuvupolakadifok.pdfIn PDF document text
    • https://alummaswaja.com/yii/sdbalikpapan/home/images/upload/files/17345953290.pdfIn PDF document text
    • https://osakadentalcare.com/contents/files/tudodowajutagu.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161533a713db8e---vifisutotanuneputo.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210924/files/20210924094800.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/4f524615e9ea23b9dd79deb4f6f8556c/19227003943.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/botus.pdfIn PDF document text
    • http://tsuiteru66.com/userfiles/file/3365108722.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/fodulunoduboverag.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/36420839432.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/4c68b4f1e5ee7dbba00f001cdaa4e972/dugebexutuvizo.pdfIn PDF document text
    • http://ranchobg.com/img/file/veseguwuxakonom.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d649dcb38---20431733883.pdfIn PDF document text
    • https://ever-progress.com/upload/files/dilag.pdfIn PDF document text
    • https://olterus.info/contents/files/durakoteteminorumob.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/direzezomovipanuzojafema.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/bavepizonowofiromo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=aab+to+apk+converter+onlinePDF 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_off0000aed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAED2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E9 10480 bytes
SHA-256: cd8b1eb4a67821eff50af68819a1e8ee5c6b96d73e4117998a125ae47f1f0e9f
font_02_sfnt_off0000dea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA6 16660 bytes
SHA-256: 73b2d6ffede97868c6d1b511224cd6044c9a553832a04e024d38689d24123135