Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad55f325718e90e2…

MALICIOUS

PDF

73.3 KB Created: 2021-09-04 03:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2b950045414b5531c01cd1ca24128e24 SHA-1: 47fd09ef6512128802bbd073c082084ad6692e02 SHA-256: ad55f325718e90e23c61bf50155716123e91fd7b581186651e00a87281e0b78e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other domains, likely serving as a distribution point for phishing or malware. The presence of external URI heuristics and link farm indicators further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://philabc.ru/uplcv?utm_term=resident+evil+3+walkthrough+pdf PDF link annotation
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/93c4948bf3fdaefba104c779bf74254e/zepijofanaguvagatanonelu.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/79587460974.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/10f5349f762f66ed589de3fb32c67cee/71846229701.pdfIn PDF document text
    • http://thcsnguyenvanhuyen.hoaiduc.edu.vn/ckfinder/userfiles/files/kozepudo.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073375483511---1656755331.pdfIn PDF document text
    • http://geraldkleinlaw.com/ckfinder/userfiles/files/xavepopifujikutejexu.pdfIn PDF document text
    • https://apra.pl/files/file/88319545224.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f05ad3800---83012269078.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/fetidovobuzodamafezegot.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa08c45e6c---sijekefasaxozigekivisala.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/jujejowizuvomidasuxofaka.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/f2c33c64f5bff323e891699756a06483/59886375394.pdfIn PDF document text
    • http://short-story.ru/upload/file/jepotizegijog.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/afc29877b90e06af99cf250558b4fbd1/vuvuwufowepexinalefariv.pdfIn PDF document text
    • http://irths.com/upload_files/files/61530027080.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/78915055105.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fe54dd9dc---gibununonebul.pdfIn PDF document text
    • http://mq-water.net/upload/1391033893.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/lejosisibo.pdfIn PDF document text
    • http://tcihk.com/userfiles/57814968638.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e60a52e8ef---91285795217.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/46e9da4eba42071419c0fccbe4c26796/niwisutogisexusuja.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_off0000bb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB45 16228 bytes
SHA-256: f03c6f452dbee6bc2b87560d2966897682b3254837a567fc040b8e67b2fb7f54
font_01_sfnt_off0000e4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C2 11340 bytes
SHA-256: 68eba5410db1e631e1b089b0f4d3987d24050abf2b6de60e3de7283e804448c0
font_02_sfnt_off0000ff49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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