Malicious PDF — malware analysis report

Static analysis result for SHA-256 651b1b2544b082a1…

MALICIOUS

PDF

77.8 KB Created: 2021-09-08 13:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 58034dd13141a294b36c5c83f038009a SHA-1: 84c52c60b7c16a2535355884089d33bd1a564eb9 SHA-256: 651b1b2544b082a1dc45eb8686efc228cabc2527f5051c41a3307611f48f5291
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, several of which point to compromised CMS upload directories, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated, preventing a clear understanding of its direct purpose beyond hosting links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://aurastaffing.es/upload/file/75825847775.pdf In PDF document text
    • https://5of7edwardstreet.com/assets/media/files/80973816668.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/12220792853.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/pabemuv.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/tizufutowelerefuwaje.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/mobiminulemetor.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/80900491657.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/580d96f850ff790112ef762a05f9e4c6/50131408797.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/bevibi.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/19402066667.pdfIn PDF document text
    • http://basar-hemeringen.de/ablage/userfiles/files/34066528722.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/35514320093.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/minenopugeratagefi.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/dizikunos.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/detelegeluvax.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/ligexanadiwupa.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613295195afe9---matisumiwew.pdfIn PDF document text
    • https://bselink.com/userfiles/file/pelagakuvakakepedikizirin.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/92677732122.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/71678989205.pdfIn PDF document text
    • http://taixingchem.com/uploadfile/file/20210902052440628.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f558db5c8---fobipakowobifusufivowito.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/49271279245.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=office+suite+pro+pdf+cracked+apkPDF 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_off0000c8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C2 10680 bytes
SHA-256: e2871fbcc6714a3064b933516d138bad742cf76d63c98a9338062795f37457c0
font_02_sfnt_off0000f977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF977 18520 bytes
SHA-256: 92dc4c877537c484ac86636ec63a1c5cbc8db1e990fa3ada2ec1eeb80644242d

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