Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3a48679290c5735…

MALICIOUS

PDF

85.6 KB Created: 2021-09-13 09:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 674da3945607e8502a5ae77a178df823 SHA-1: 55dc415e94e6f829ef74b5aa7720f2419771e181 SHA-256: d3a48679290c57358dc66606a6f3ee1d475ef80877aa3860b41de6f753d1f6d0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://huerural.com/uploads/image/files/15481440016.pdf
    • https://preciseenergygroup.com/media/90529259977.pdf
    • http://efrex.cz/files/file/54477413685.pdf
    • http://www.elstar.ru/uploads/files/dutosi.pdf
    • http://oilmachineydy.com/d/files/mokenokosareraj.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb843cef97---465121309.pdf
    • http://yuanhebiotech.com/upload/files/31862448705.pdf
    • http://dragonera.cn/admin/userfiles/file/xonegukirixari.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/78d18768875eeb1018717b63060739da/90958586061.pdf
    • https://ismart99.net/upload/files/97587042066.pdf
    • http://outspokenholland.com/userfiles/fckFile/20210903062619.pdf
    • https://bodzlomu.com/userfiles/file/21021940260.pdf
    • http://pobierzplik.pl/uploads/files/xidivaraj.pdf
    • http://studioesflores.pl/obrazy/file/lunuwajelimupezavujep.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba73a5f85d---53821554041.pdf
    • http://technoauto.jp/js/upload/files/68189164931.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/b0e623e7429d47cafef55f3644c0fa79/9686297888.pdf
    • http://benly-carson.com/product/files/47653939786.pdf
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/24609742434.pdf
    • https://karapinler.com/calisma2/files/uploads/jaxazotesew.pdf
    • https://darshanam.com/ckfinder/userfiles/files/50970738456.pdf
    • https://fix2go.info/userfiles/file/melijijifilurulugelerumap.pdf
    • http://ipllaser.in/uploads/66989882893.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161302784d1381---xanusadatolufewesogim.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=auto+call+recorder+android
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/72580153414.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eafd.bin
e976e3ac37419c6573e15527e9c0a094390977bf3d586f48506b963b93286cd7
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFD 17996 bytes
font_01_sfnt_off000119b8.bin
7374313b7004f6f62f532db07c613b762791c50794e7e1f904665477d615f280
pdf-font-stream PDF embedded font (sfnt) at offset 0x119B8 10276 bytes
font_02_sfnt_off000130f5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x130F5 16792 bytes