Malicious PDF — malware analysis report

Static analysis result for SHA-256 53d9fcea95c7e9bb…

MALICIOUS

PDF

67.7 KB Created: 2021-10-02 09:30:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e06e96eb26afda4a371a5b9628114f4b SHA-1: 3c60b5f151d9c329b09f28b74b3c72704040a013 SHA-256: 53d9fcea95c7e9bbe13a573d187e703616f704baac292ac417f3101ab3133d60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to manipulate search engine rankings or direct users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/aaf2b11f5846d27cd482520540c69054/90853838547.pdf In PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/mederofowaxezufonug.pdfIn PDF document text
    • http://ave-france.com/pics/files/wesinoresuvutowaxibiwugux.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/46336140393.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/niranubutigunipesikadop.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/gududodovexizowidetiwu.pdfIn PDF document text
    • http://apsons.eu/files/file/kirebibijukafivebirozad.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210920085951.pdfIn PDF document text
    • http://01host.ru/userfiles/files/sebinegizezelibib.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16134178595581---kusalewu.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/40028703183.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/falatiruregusu.pdfIn PDF document text
    • http://biomehl.com/images/content/files/tipawemiruwalisezinadiva.pdfIn PDF document text
    • https://okna-kursk.ru/page_edit/_samples/userfiles/files/lugazo.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/98703382441.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/76435192131.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/74466347314.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210930235422710.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/xepimo.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109222024535231.pdfIn PDF document text
    • http://blueyee.com/upload/file/07123052447.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161458f4f75ac0---temasilevipogogoxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=i+ching+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_off0000adb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADB8 15328 bytes
SHA-256: 602ed9e9e88fc6e6555b074ab1c41d583ac9f2268e257b44c02689d44e6cdafe
font_01_sfnt_off0000d3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EE 9932 bytes
SHA-256: 867a2d631430dd7097fd3ed8bf386e62d58354e85a9e807caf29d30056b5ee2f
font_02_sfnt_off0000e9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1