Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b623294db77ac55…

MALICIOUS

PDF

69.6 KB Created: 2021-10-04 13:37:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 21266912f769f55fffd052df344048e4 SHA-1: 65d879a3759c19e0ee72e65c8e7dc4e6921b6fa9 SHA-256: 4b623294db77ac55d71d8d060571129d4e2c490d14ae9648e38bdc35e1366311
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also features a large number of external links, many of which point to compromised websites or disposable hosting, indicating a potential phishing or redirection scheme. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=questions+on+angle+of+elevation+and+depression PDF link annotation
    • https://gestcargo.com/uploadfiles/file/8474869140.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc3f6619ec---35122508015.pdfIn PDF document text
    • http://czyxchem.com/upload/files/sivumazuxizunomoxus.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/xudajutiwa.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/35459608458.pdfIn PDF document text
    • http://www.toptehnik.si/images/kijelinej.pdfIn PDF document text
    • http://starma.pl/files/file/35432582207.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/65521707973.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/pumusirinuninifabapifola.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/62726710196.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16140c4b807105---80734273802.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/22470404447.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/60057699643.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/getasopipitedunitodikamas.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///17976157375.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/35878228622.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/xipaselevetobemofujudepov.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/63456352689.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/16118125728.pdfIn PDF document text
    • https://agrando.cz/files/file/18411501654.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/vosoviremedumurefotamijo.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/6rf5ftmu33e6nje2apcjeq91ou/sixil.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16159a67d3f04a---86033736992.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_off0000b072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB072 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC884 15400 bytes
SHA-256: e66be66c1bb75bf23bd4636a343f05970b3c85667610a5b7650430cba5402f03
font_02_sfnt_off0000efa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA6 10900 bytes
SHA-256: 6627c7688571ba1b7eb6114e450f28d73df51756be75fa673d961af0a0c70ff3