Malicious PDF — malware analysis report

Static analysis result for SHA-256 53025a470d90f0f5…

MALICIOUS

PDF

79.3 KB Created: 2021-09-15 07:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 547d4bca915f45cbd5c9420470abf9ac SHA-1: 7d69a557612ab263c04cfa1aa788b770d67f9cac SHA-256: 53025a470d90f0f591fc7a53af3d33c6bf46f62e8e31e02b48851056563f5e00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm with numerous URLs, many pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on disposable hosting and compromised sites suggests a tactic to evade detection and maximize reach.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/dadodoz.pdf In PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333191ebea5---71858499738.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/lemaluvikudavaneduma.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/93252621675.pdfIn PDF document text
    • https://botroul.be/uploads/kawivorekiwi.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/82292281217.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/64715664336.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210905201741.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/jajomavotedawosutivarifax.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/mibedowoguwofigevaforemav.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/f555feb9e1e0a4329d816a029b72723f/15088939843.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/81931631711.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/varixuwadadanokirixupuja.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/bepololoro.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161416a4eea39d---59063173574.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/3373e888a27b05bfe0ed3859f47c2828/95671057322.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365413305d3---1957197759.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/zumekepolifo.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/410ef6d988230d2836efdfcf03fdeafd/vutenazisijig.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/xofofaveta.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1614138a259bfe---zolip.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/45c66ee74f159cc00640e3c47754c063/76668624584.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=uf+free+games+minecraftPDF 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_off0000d2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D7 17516 bytes
SHA-256: f52d665fd99ba7b64206ce54a157a60788e56e9d4d892c5407245492f4bf2d18
font_01_sfnt_off0000fffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11814 10520 bytes
SHA-256: f63eca7ee2ac22c02a3bab29a5eaca1d7b92e4bf898be631d21cd4f2d7d72e71