Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ce78f3a0ace1740…

MALICIOUS

PDF

85.6 KB Created: 2021-09-01 13:26:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 28449a5ca022a67a5a9820327305d784 SHA-1: f66ee5d83c023f401c2ffd5a68fda7edab7afde0 SHA-256: 8ce78f3a0ace1740f96893c29d33ff8b5baa8a8ef165447b0d5af8d47fb9de40
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as compromised CMS uploads or hosted on disposable infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farms suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://allytemp.ru/uplcv?utm_term=criticism+of+work+adjustment+theory PDF link annotation
    • http://itemclinicchina.com/ckupload/files/movukeveguzewezep.pdfIn PDF document text
    • http://mebco.ru/images/file/dukuzo.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/83737109829.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f5b38ad94---zefivabuponib.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/t6j4bd634qifso4hl791ls41nk/memutepagidupafetejoriso.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/05/file/202105150301117455.pdfIn PDF document text
    • http://erdbau-rauch.at/45202685212.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/sorewosojogimavaralovesep.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/mapemurojajefu.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607673cba9881---diritelebibedufewepotine.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/sanamisa.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/gixakuvej.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/zitom.pdfIn PDF document text
    • https://venus-forever.com/image/files/22100680705.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/pamebazosinisoxonesode.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/vawemuwatozozebejiw.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/vibamowexiviruto.pdfIn PDF document text
    • http://gdgom.com/upload/file/210621071111635408i8xcf43xoo6c.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/ba9098140e2c9109c76bb795293fe113/97062594777.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/2t4cqnh70jkaoj94jolcnj8g0g/64872717030.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/31763962336.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609abc13e0784---mapudojujekewurakaz.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/wosutujafob.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_off0000e639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE639 11248 bytes
SHA-256: 23f9161516da3037b812ebefd8d7bb5f13c582f8e8cae785ad691aa2b0f64546
font_01_sfnt_off00010086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10086 18104 bytes
SHA-256: 9a48cfd724fb21623a20651d2e787908dae9fb89e0fe26c7f40ce6b3256e8739
font_02_sfnt_off00012f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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