Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bb9e4675a11ed61…

MALICIOUS

PDF

69.3 KB Created: 2021-09-09 17:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 733b2a2bd521ff05976221b2103fa2c1 SHA-1: 1be21c420cc10ad52844d1b84113f22bccadb92c SHA-256: 5bb9e4675a11ed612d3b43337083d994710ce62ae88a4676284ce3cefc7a0de4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The `wkhtmltopdf` authoring application and the presence of embedded URLs indicate a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://allytemp.ru/uplcv?utm_term=change+android+gps+location PDF link annotation
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f462ed714---mipenisusogakojefo.pdfIn PDF document text
    • http://eubeer.vn/uploads/files/tolujutunirukalutiba.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/fabejoxug.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/13820380843.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210906180315149.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/64696997229.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16139b3e9db4d2---fakerofofapaginumubu.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/16224601918.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/88906955557.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210905_055418.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300423a2a7d---39344136701.pdfIn PDF document text
    • http://mislenyiallatorvos.hu/userfiles/file/80338767414.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161305794f3a0b---32792933333.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/20969280691.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/98205836256.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/44294051309.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/65487805080.pdfIn PDF document text
    • https://diphong.com/uploads/42472300457.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/xizovigig.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/faviligi.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/borojufurarided.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/35065146359.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/92563821346.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/gurabitonavogaganoranuxa.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_off0000b151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB151 14944 bytes
SHA-256: abdee1b0887875c9ff063ecc2d46e26500d53e2745acc46ab42f9465a93be65d
font_01_sfnt_off0000d6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF3 10824 bytes
SHA-256: 18be812d01841720ad1f6cdc18e27fb52caade464081f90fd0b99248fd3fefa8

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