Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2cc993c8eae9106…

MALICIOUS

PDF

77.2 KB Created: 2021-09-02 18:25:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: af768b77de12dc7738e1ebb8443db92e SHA-1: c4eccee8cecce1e526f1a9ffc776728973a4cc24 SHA-256: e2cc993c8eae9106c5fca5143be6d07cabe4dd212eab59ca4c206832bcfa24ac
156 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS upload storage or disposable domains. This behavior is indicative of a phishing or malware distribution campaign, where users are lured to malicious sites. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://patriciogaete.com/upload/file/lemusitejajawagosowurix.pdf In PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/f485b0403ac1c41224492ed216636347/84992500060.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/jixajuvulogoregupizodel.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/keritifuwoxuwodelaxo.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/55882249538.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/ninaseseguzuwumamod.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/06/24/file/50360707846.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f9a96413b---veremukoselikusigin.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/d03eb6f1832c7052dd8b26ebd4c05200/tusipirej.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612e4a17d0c1d---10163117374.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/webujuze.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160823bbf599c7---6205995834.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/kuwamukir.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1611f69f934ffb---15691999421.pdfIn PDF document text
    • https://wonkingchina.com/d/files/24496218324.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/17fddb0f9459ccb6ecd1797f8c331608/xumovusonani.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/39829762269.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/d9100fc2b40e1d7b367c8165380054d5/sosoxukuparosef.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607750fb1bc9b---navugul.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/32f631bbe0d144d0683aba901951c543/75677232233.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/4764408036.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=hepatitis+c+definicion+pdfPDF 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_off0000c8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FE 10460 bytes
SHA-256: 895473901b6f32cfe1d8a552fb688c5023987a2498ed707ab64ccd4d4d1e6e39
font_01_sfnt_off0000e0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D1 17916 bytes
SHA-256: 7046179e15ffcc96529e8104bbcccf9aa6142b480626cdd668491a059f9359be
font_02_sfnt_off00010f70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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