Malicious PDF — malware analysis report

Static analysis result for SHA-256 25bdd2a82b507e39…

MALICIOUS

PDF

72.5 KB Created: 2021-09-26 07:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 272ba99fa934a7e76ffbadd653c973f8 SHA-1: eaa979b067bb30f0861d3bb06191eb87d707a099 SHA-256: 25bdd2a82b507e398631d0a3f51fd0980eec1922462ec53bcc6c01c6069bd4ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to what appear to be compromised WordPress sites, suggesting a link farm used for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e166130dfc---74142273536.pdf In PDF document text
    • https://vsetinrally.cz/userfiles/file/lawagagejedalaraxavenis.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/firosajasojibebuzesuxo.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/24218173247.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/27742722018.pdfIn PDF document text
    • http://recrute.fr/files/files/42845000510.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/58718731430.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/102ce1bf6a2ab46ae7a8f8c3ca176d37/28840758863.pdfIn PDF document text
    • http://chinalabware.ru/d/files/47505760490.pdfIn PDF document text
    • https://menu2uplus.com/images/file/dozotorurisulune.pdfIn PDF document text
    • https://kluchar.net/klucharnet/images/file/10046572848.pdfIn PDF document text
    • http://xuanfe.com/uploads/FCKeditor/file/41214857471.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/62918813963.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/88553460464.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613267b62f75e---vuremojalixotukav.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/zudilupogafozodinivapisob.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/14856426795.pdfIn PDF document text
    • http://carcrome.com/userfiles/file/zupipedomel.pdfIn PDF document text
    • http://ltpbetel.ro/userfiles/file/81584247231.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/519c2b1541f95f9240af8ed2bb9b69f2/rugipi.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/rekedipidagada.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/d388189d8ecd217e0bbcf950f26720e7/90420615853.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=crazy+rich+asians+full+movie+for+freePDF 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_off0000b3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A3 18084 bytes
SHA-256: 41bc51ded1fb482619ae686072ca27e1c7c0821e0c4076b2e172d9c987c620a3
font_01_sfnt_off0000e152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE152 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF969 10872 bytes
SHA-256: 5b5496f24aebc2a1e97dd000a828bb7a678209ef21405518c2f1ac78195c6236