Malicious PDF — malware analysis report

Static analysis result for SHA-256 891f103c18c4955e…

MALICIOUS

PDF

80.3 KB Created: 2021-09-02 04:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c89a34ad026105e5d40d849df04b43f0 SHA-1: f6b448f941503223620782bbcb366a4dd8ab7c53 SHA-256: 891f103c18c4955e57f4d85e6d1de77e1d3b755cd9ff5e362c9cfa41877479c7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://sadiqandsons.com/userfiles/files/71366554839.pdf In PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/s01ojkqc6fb2lam836nf9a5cu8/radesagutolefob.pdfIn PDF document text
    • http://es-hanasaki.com/yamituki-n/uploads/files/faximovabedejiwodotuzekup.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4b7f5dccb---86696855856.pdfIn PDF document text
    • https://deepex.hu/hirek/files/90936993712.pdfIn PDF document text
    • https://2winit.com/Files/files/gutema.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/32826678940.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/ebaa5ef9d44f1bcdb9ab7afd33d7ff90/falidokofumobejexud.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16086b3986a4ff---11093102402.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c18e01c076---tafudazerekul.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/18781101742.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077cd9a98481---15191385426.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a61beaf22---22512111592.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/talesopizenejovir.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/d74e5e4e7c7fbf64e64830178442edd5/49015660478.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210523055521.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/jinenid.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/41682987060a242c63c707.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/65202047448.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083334c0ef2c---rajajibe.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b33e9583b94---jukabawidofunuko.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/21182722046.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/51997800749.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16251393521034.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/80321162176.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/07/03/48788767788.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=double+angry+whopperPDF 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_off0000d23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23E 18608 bytes
SHA-256: 104be8824c6badef3a78c09ca1cd5a620ba1f727de9c86d5e6716e6befb3db64
font_01_sfnt_off000102c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C0 10616 bytes
SHA-256: f05da0abd44df0499f8d7c6751012ecd9695c229b31a4be4fb2b5d9cbaa178d4
font_02_sfnt_off00011ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1