Malicious PDF — malware analysis report

Static analysis result for SHA-256 19a1ad5d1a397ead…

MALICIOUS

PDF

103.1 KB Created: 2021-08-17 22:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9b84cc0929421b216976fd4b46d794a2 SHA-1: de15cabecf2339af395f193f3655c390eb6d98e8 SHA-256: 19a1ad5d1a397ead4b557f15ba8aed6206cd9a469cdb8f715c5db8069be462a2
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS upload storage or disposable hosting. The presence of these links suggests an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://zajazd-broadway.pl/galeria/file/62975021678.pdf In PDF document text
    • https://manenshop.com/upload/files/fejuwalev.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1aa56b97d---18300853038.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/26686278197.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/18166514797.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/85809494775.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/51336916912.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/30160142798.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8270b25b8---1349277084.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/72ab6a29b95930f2da434594f5cf3b92/jobedolepirapibogujixi.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/degawutegojovomirixewa.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/zobijo.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/55713582860.pdfIn PDF document text
    • http://topstec.com/d/files/xajakixofev.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099cbbe4b82c---2024629646.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/37683058902.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/d7ac283f1eee58dc4352c23855d3776c/97424540979.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608667e91255a---dipeserapazawibagupan.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0aa0e5698---vuxeligun.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/45500273509.pdfIn PDF document text
    • https://songhong.info/userfiles/file/wosenun.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/junexujiponu.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/ludufilugefetafa.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/85285867505.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/7c4d5a5f855ad5328f8a9a36843b207f/81388643244.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=hosanna+marcos+barrientos+acordes+guitarra+electricaPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E48 21672 bytes
SHA-256: 258ef2e981392607fd2a8c18e502e868d1031ad7c18aa75381909564e3529a13
font_01_sfnt_off000144af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CC6 10944 bytes
SHA-256: 20349e806295f672f3564765e55fd8baa7dce02693f24ac54c30d7588bfd11c6
font_03_sfnt_off000175d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175D9 16828 bytes
SHA-256: e4deca0f4e0f08cd0aff2f7c99ecb8ef8051ba2641df304581a9774be5c99aa2