Malicious PDF — malware analysis report

Static analysis result for SHA-256 670b2e7f7b9417ad…

MALICIOUS

PDF

81.5 KB Created: 2021-09-16 13:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d0b2c07d9b07032cc33dfcf65898b2e9 SHA-1: 27f81b17cbffb401ea12cd95b65d13ce0a9a8aca SHA-256: 670b2e7f7b9417adf390a671ef4c45cd8fcb435b3e262340a6b2d0daf803c4e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification strongly suggests malicious intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, but the heuristic firings clearly point to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=the+new+mutants+watch+online+putlocker PDF link annotation
    • http://preciz.com/uploads/wysiwyg/files/noxujejasaz.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/72156814351.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/97363510642.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/madarilin.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210903115126.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/xuwefe.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/90180180074.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/59932252261.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/zozosokox.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/niserudon.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/e881b989eb6fc65b560cf4e6e5162d0e/70010465937.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/lelijidawunosa.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/mejajazelapuzapugezoge.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613772577719b---jamavosagigari.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/sofiva.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc30740e88---digotanazul.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/nowogifarezediperalerog.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/zajowerotudidunigerijasux.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/94783993609.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/figeki.pdfIn PDF document text
    • https://anup.bo/images/files/20204995436.pdfIn PDF document text
    • http://cl-pub.com/files/files/gajejofololobusisupovu.pdfIn PDF document text
    • http://kodemari.info/data/files/jebojojoso.pdfIn PDF document text
    • http://cabini.it/userfiles/files/pibimizi.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_off0000d97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18C 17844 bytes
SHA-256: a2c420458324f46377f91c8731d6b725c4073f06c16e17bd23c09e0767d48645
font_02_sfnt_off00011fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAD 10880 bytes
SHA-256: 1f42d4e5d082eb9d1f0167b0c2f91b53b013e20fa8a09e4d8e35341043c1d23b

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